Climate Change Debate
Pros and Cons
Video exploring critical thinking and how it leads to great citizen involvement
Last updated on: 8/15/2012 2:36:16 PM PST

Is Human Activity a Substantial Cause of Global Climate Change?


PRO (yes) CON (no)
James E. Hansen, PhD, Director of the Goddard Institute for Space Studies at NASA, et al., stated the following in their Aug. 6, 2012 study "Perception of Climate Change," published in the Proceedings of the National Academy of Sciences:

"The greatest barrier to public recognition of human-made climate change is probably the natural variability of local climate…

Actions to stem emissions of the gases that cause global warming are unlikely to approach what is needed until the public recognizes that human-made climate change is underway and perceives that it will have unacceptable consequences…

Recent high profile heat waves, such as the one in Texas and Oklahoma in the summer of 2011, raise the question of whether these extreme events are related to the on-going global warming trend, which has been attributed with a high degree of confidence to human-made greenhouse gases...

The increase of these extreme anomalies, by more than an order of magnitude, implies that we can say with a high degree of confidence that events such as the extreme summer heat in the Moscow region in 2010 and Texas in 2011 were a consequence of global warming...

There are many other human-induced stresses on life… yet global warming caused by fossil fuel burning may be a unique threat because of the millennial time scale of anthropogenic carbon within surface carbon reservoirs.

It has been argued that a scenario phasing out carbon emissions fast enough to stabilize climate this century, limiting further warming to a maximum of several tenths of a degree Celsius, is still possible, but it would require a rising price on carbon emissions sufficient to spur transition to a clean energy future without burning all fossil fuels.”


Aug. 6, 2012 - James E. Hansen, PhD 

Richard A. Muller, PhD, Professor of Physics at the University of California at Berkeley and Faculty Senior Scientist at the Lawrence Berkeley Laboratory, stated the following in his July 28, 2012 OP-ED "The Conversion of a Climate-Change Skeptic," available at www.nytimes.com:

"Three years ago I identified problems in previous climate studies that, in my mind, threw doubt on the very existence of global warming. Last year, following an intensive research effort involving a dozen scientists, I concluded that global warming was real and that the prior estimates of the rate of warming were correct. I’m now going a step further: Humans are almost entirely the cause...

Our [Berkeley Earth Surface Temperature project] results (1.3MB)  show that the average temperature of the earth’s land has risen by two and a half degrees Fahrenheit over the past 250 years, including an increase of one and a half degrees over the most recent 50 years. Moreover, it appears likely that essentially all of this increase results from the human emission of greenhouse gases...

We carefully studied issues raised by skeptics: biases from urban heating (we duplicated our results using rural data alone), from data selection (prior groups selected fewer than 20 percent of the available temperature stations; we used virtually 100 percent), from poor station quality (we separately analyzed good stations and poor ones) and from human intervention and data adjustment (our work is completely automated and hands-off). In our papers we demonstrate that none of these potentially troublesome effects unduly biased our conclusions...

[O]ur record is long enough that we could search for the fingerprint of solar variability, based on the historical record of sunspots. That fingerprint is absent...

How definite is the attribution to humans? The carbon dioxide curve gives a better match than anything else we’ve tried. Its magnitude is consistent with the calculated greenhouse effect — extra warming from trapped heat radiation... our analysis does not depend on large, complex global climate models, the huge computer programs that are notorious for their hidden assumptions and adjustable parameters. Our result is based simply on the close agreement between the shape of the observed temperature rise and the known greenhouse gas increase."

[Editor's Note:  The Berkeley Earth Surface Temperature Project published the results of its research on Oct. 11, 2011, as four draft papers:  "Influence of Urban Heating on the Global Temperature Land Average" (361KB) "Earth Atmospheric Land Surface Temperature and Station Quality in the United States" (588KB) , "Berkeley Earth Temperature Averaging Process" (1MB) , and "Decadal Variations in the Global Atmospheric Land Temperatures" (741KB) .]


July 28, 2012 - Richard A. Muller, PhD 

The National Academy of Sciences stated the following in the introduction to their May 19, 2010 report "Advancing the Science of Climate Change," available at www.americasclimatechoices.org:

"[H]uman activities are influencing the climate. As discussed in the following chapters, scientific evidence that the Earth is warming is now overwhelming. There is also a multitude of evidence that this warming results primarily from human activities, especially burning fossil fuels and other activities that release heat-trapping greenhouse gases (GHGs) into the atmosphere.

Projections of future climate change indicate that Earth will continue to warm unless significant and sustained actions are taken to limit emissions of GHGs. These increases in temperature and GHG concentrations are driving a multitude of related and interacting changes in the Earth system, including decreases in the amounts of ice stored in mountain glaciers and Polar Regions, increases in sea level, changes in ocean chemistry, and changes in the frequency and intensity of heat waves, precipitation events, and droughts. These changes in turn pose significant risks to both human and ecological systems."


May 19, 2010 - National Academy of Sciences 

The Intergovernmental Panel on Climate Change (IPCC), an intergovernmental body with 184 member countries (as of June 2010) set up by the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP), wrote the following in its Nov. 2007 summary of the report "Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change," available at www.ipcc.ch:

"Global atmospheric concentrations of carbon dioxide, methane and nitrous oxide have increased markedly as a result of human activities since 1750 and now far exceed pre-industrial values determined from ice cores spanning many thousands of years. The global increases in carbon dioxide concentration are due primarily to fossil fuel use and land use change, while those of methane and nitrous oxide are primarily due to agriculture…

The global atmospheric concentration of carbon dioxide has increased from a pre-industrial value of about 280 ppm to 379 ppm in 2005. The atmospheric concentration of carbon dioxide in 2005 exceeds by far the natural range over the last 650,000 years (180 to 300 ppm) as determined from ice cores…

Warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice, and rising global average sea level…

Most of the observed increase in global average temperatures since the mid-20th century is very likely [90% probability] due to the observed increase in anthropogenic greenhouse gas concentrations.”


Nov. 2007 - Intergovernmental Panel on Climate Change (IPCC) 

255 members of the National Academy of Sciences, signed a May 7, 2010 letter, titled "Climate Change and the Integrity of Science," published in Science:

"[T]here is compelling, comprehensive, and consistent objective evidence that humans are changing the climate in ways that threaten our societies and the ecosystems on which we depend...

(i) The planet is warming due to increased concentrations of heat-trapping gases in our atmosphere. A snowy winter in Washington does not alter this fact.

(ii) Most of the increase in the concentration of these gases over the last century is due to human activities, especially the burning of fossil fuels and deforestation.

(iii) Natural causes always play a role in changing Earth's climate, but are now being overwhelmed by human-induced changes."


May 7, 2010 - "Climate Change and the Integrity of Science" (134KB)  

Michael E. Mann, PhD, Professor in the Departments of Meteorology and Geosciences at Pennsylvania State University, stated the following in his Feb. 10, 2010 article "Science Supports Climate Change Claims - A Letter from Michael Mann," available at www.voicesweb.org:

"[T]he scientific case for human-caused climate change is clear.  The evidence includes independent assessments of thermometer records documenting the degree and extent of modern warming. It includes the unprecedented melting of glaciers and, as documented in more recent years, the diminution of the Greenland and Antarctic ice sheet. As a consequence of melting ice and warming oceans, the global sea level is rising and at an accelerating rate. Continental drought is becoming more pronounced in many extratropical regions, such as the deserts of the U.S. Southwest, and there is an increase in the destructive potential of Atlantic hurricanes that influence the east and Gulf coasts. Theoretical climate models predict these things to happen, but only when human influences - in particular, increasing greenhouse gas concentrations due to fossil fuel burning—are included.

Those same models project far more profound and potentially damaging impacts of climate change if action is not taken to stabilize greenhouse gas levels this next decade...

Sadly, some who are opposed to taking action to combat the potential threat have engaged in a smear campaign that appears intended to distract the public and policymakers from the reality of the threat as policymakers begin to consider taking more serious action to reduce greenhouse gas emissions."


Feb. 10, 2010 - Michael E. Mann, PhD 

The United Nations Framework Convention on Climate Change (UNFCCC) stated the following in its publication "Feeling the Heat," available at unfccc.int (accessed May 12, 2010):

"The average temperature of the earth's surface has risen by 0.74 degrees C since the late 1800s. It is expected to increase by another 1.8° C to 4° C by the year 2100 - a rapid and profound change - should the necessary action not be taken...

The principal reason for the mounting thermometer is a century and a half of industrialization: the burning of ever-greater quantities of oil, gasoline, and coal, the cutting of forests, and the practice of certain farming methods.

These activities have increased the amount of 'greenhouse gases' in the atmosphere, especially carbon dioxide, methane, and nitrous oxide. Such gases occur naturally - they are critical for life on earth, they keep some of the sun's warmth from reflecting back into space, and without them the world would be a cold and barren place. But in augmented and increasing quantities, they are pushing the global temperature to artificially high levels and altering the climate. Eleven of the last 12 years are the warmest on record...

The current warming trend is expected to cause extinctions. Numerous plant and animal species, already weakened by pollution and loss of habitat, are not expected to survive the next 100 years. Human beings, while not threatened in this way, are likely to face mounting difficulties. Recent severe storms, floods and droughts, for example, appear to show that computer models predicting more frequent 'extreme weather events' are on target."


May 12, 2010 - United Nations Framework Convention on Climate Change (UNFCCC) 

Andrew Dessler, PhD, Professor in the Department of Atmospheric Sciences at Texas A&M University, et al., stated the following in their Mar. 6, 2010 article, "On Global Warming, the Science Is Solid," published in the Houston Chronicle:

"Contrary to what one might read in newspapers, the science of climate change is strong. Our own work and the immense body of independent research conducted around the world leaves no doubt...

There is no question that natural causes, such as changes in energy from the sun, natural cycles and volcanoes, continue to affect temperature today... But despite years of intensive observations of the Earth system, no one has been able to propose a credible alternative mechanism that can explain the present-day warming without heat-trapping gases produced by human activities...

[H]umans have taken over from nature as the dominant influence on our climate."


Mar. 6, 2010 - Andrew Dessler, PhD 

Kerry Emanuel, PhD, Director of the Program in Atmospheres, Oceans, and Climate at the Massachusetts Institute of Technology (MIT), stated the following in his Feb. 15, 2010 article "Despite Uncertainties, Need to Confront Climate Change Is Clear," published in the Boston Globe:

"[C]oncentrations of the two most important long-lived greenhouse gases, carbon dioxide and methane, have been increasing since the dawn of the industrial era; carbon dioxide alone has increased by about 40 percent. These increases have been brought about by fossil fuel combustion and changes in land use...

[G]lobal temperatures have been rising for roughly the past century and have so far increased by about 1.4 F. The rate of rise of surface temperature is... larger than any natural change we have been able to discern for at least the past 1,000 years.

Disputes within climate science concern the nature and magnitude of feedback processes involving clouds and water vapor, uncertainties about the rate at which the oceans take up heat and carbon dioxide, the effects of air pollution, and the nature and importance of climate change effects such as rising sea level, increasing acidity of the ocean, and the incidence of weather hazards such as floods, droughts, storms, and heat waves. These uncertainties are reflected in divergent predictions of climate change made by computer models...

But when the dust settles, what we are left with is the evidence. And, in spite of all its complexity and uncertainties, we should not lose track of the simple fact that theory, actual observations of the planet, and complex models - however imperfect each is in isolation - all point to ongoing, potentially dangerous human alteration of climate."


Feb. 15, 2010 - Kerry Emanuel, PhD 

Al Gore, Jr., former Vice President of the United States and Chairman of the Board at the Alliance for Climate Protection, stated the following in his Feb. 27, 2010 article "We Can't Wish Away Climate Change," published in the New York Times:

"[T]he scientific enterprise will never be completely free of mistakes. What is important is that the overwhelming consensus on global warming remains unchanged...

Here is what scientists have found is happening to our climate: man-made global-warming pollution traps heat from the sun and increases atmospheric temperatures. These pollutants - especially carbon dioxide - have been increasing rapidly with the growth in the burning of coal, oil, natural gas and forests, and temperatures have increased over the same period. Almost all of the ice-covered regions of the Earth are melting - and seas are rising. Hurricanes are predicted to grow stronger and more destructive, though their number is expected to decrease. Droughts are getting longer and deeper in many mid-continent regions, even as the severity of flooding increases. The seasonal predictability of rainfall and temperatures is being disrupted, posing serious threats to agriculture. The rate of species extinction is accelerating to dangerous levels."


Feb. 27, 2010 - Al Gore, Jr. 

The US Environmental Protection Agency (EPA), stated the following in its Apr. 2009 publication "Frequently Asked Questions about Global Warming and Climate Change," available at www.epa.gov:

"The Earth's climate is changing.  In most places, average temperatures are rising... The most rapid warming has occured in recent decades.  Most of this recent warming is very likely the result of human activities.

Many human activities release 'greenhouse gases' into the atmosphere. The levels of these gases are increasing at a faster rate than at any time in hundreds of thousands of years.

We know that greenhouse gases trap heat. If human activities continue to release greenhouse gases at or above the current rate, we will continue to increase average temperatures around the globe. Increases in global temperatures will most likely change our planet’s climate in ways that will have significant long-term effects on people and the environment...

Within the past 30 years, the rate of warming across the globe has been approximately three times greater than the rate over the last 100 years. Past climate information suggests the warmth of the last half century is unusual in at least the previous 1,300 years in the Northern Hemisphere...

If humans continue to emit greenhouse gases at or above the current pace, we will probably see an average global temperature increase of 3 to 7°F by 2100, and greater warming after that."


Apr. 2009 - US Environmental Protection Agency (EPA) 

John R. Christy, PhD, M.Div, Professor of Atmospheric Science and Director of the Earth System Science Center at the University of Alabama at Huntsville, provided the following testimony on Aug. 1, 2012 before the US Senate Environment and Public Works Committee, available at www.epw.senate.gov:

"It is popular again to claim that extreme events, such as the current central US drought, are evidence of human-caused climate change. Actually, the Earth is very large, the weather is very dynamic, and extreme events will continue to occur somewhere, every year, naturally…

New discoveries explain part of the warming found in traditional surface temperature datasets. This partial warming is unrelated to the accumulation of heat due to the extra greenhouse gases, but related to human development around the thermometer stations...

Widely publicized consensus reports by 'thousands' of scientists are misrepresentative of climate science, containing overstated confidence in their assertions of high climate sensitivity...

...[C]limate models overestimate the response of temperature to greenhouse gas increases. Also shown was a lack of evidence to blame humans for an increase in extreme events. One cannot convict CO2 of causing any of these events, because they've happened in the past before CO2 levels rose...

It is a simple fact that CO2 is plant food and the world around us evolved when levels of CO2 were five to ten times what they are today. Our green world is a consequence of atmospheric CO2. And, food for plants means food for people. The extra CO2 we are putting into the atmosphere not only invigorates the biosphere, but also enhances the yields of our food crops. This is a tremendous benefit to nature and us in my view..."


Aug. 1, 2012 - John Christy, PhD, M.Div 

Tim Ball, PhD, former Geography Professor at the University of Winnipeg, stated the following in his July 7, 2008 article "Alarmists Use Weather to Promote Global Warming Hoax," available at canadafreepress.com:

"Claims that recent severe weather and flooding in the US are proof of human CO2 impacts on global climate are scientific nonsense...

Those who perpetrated possibly the greatest deception in human history that CO2 is causing global warming/climate change are scared. Events are driving them to extreme, unsubstantiated and even ridiculous claims and threats.

One of these was that sea level would rise, but it foundered when the two Nobel Peace Prize winners, the Intergovernmental Panel on Climate Change (IPCC) and Al Gore were in serious disagreement. Another was Arctic sea ice except it returned to long term normal levels last winter and NASA announced the one year anomaly was due to changes in wind patterns.

So they return to their central theme of convincing you that normal weather events are abnormal...

Proponents of human caused climate change will... continue their practice of claiming natural events as unnatural. Unless people understand the basic science they will continue the fraud and pressure politicians into even more damaging energy and environmental policies."


July 7, 2008 - Tim Ball, PhD 

The Center for the Study of Carbon Dioxide and Global Change, in a position statement written by Chairman C.D. Idso, PhD, and Vice President K.E. Idso, PhD, stated the following in its 2008 publication "Carbon Dioxide and Global Warming: Where We Stand on the Issue," available at www.co2science.org:

"There is little doubt the air's CO2  concentration has risen significantly since the inception of the Industrial Revolution; and there are few who do not attribute the CO2 increase to the increase in humanity's use of fossil fuels.  There is also little doubt the earth has warmed slightly over the same period; but there is no compelling reason to believe that the rise in temperature was caused by the rise in CO2...

Proponents of the notion that increases in the air's CO2 content lead to global warming point to the past century's weak correlation between atmospheric CO2 concentration and global air temperature as proof of their contention.  However, they typically gloss over the fact that correlation does not imply causation, and that a hundred years is not enough time to establish the validity of such a relationship when it comes to earth's temperature history...

In thus considering the seven greatest temperature transitions of the past half-million years - three glacial terminations and four glacial inceptions - we note that increases and decreases in atmospheric CO2 concentration not only did not precede the changes in air temperature, they followed them, and by hundreds to thousands of years...

Hence, the climate history of the past half-million years provides absolutely no evidence to suggest that the ongoing rise in the air's CO2 concentration will lead to significant global warming...

Proponents of the CO2-induced global warming hypothesis often predict that extreme weather events such as droughts, floods, and hurricanes will become more numerous and/or extreme in a warmer world; however, there is no evidence to support this claim.  In fact, many studies have revealed that the numbers and intensities of extreme weather events have remained relatively constant over the last century."


2008 - Center for the Study of Carbon Dioxide and Global Change 

31,487 American scientists (306 KB) have, as of June 2010, signed the "Global Warming Petition Project," circulated by the Oregon Institute of Science and Medicine, available at www.petitionproject.org, that said in part:

"There is no convincing scientific evidence that human release of carbon dioxide, methane, or other greenhouse gases is causing or will, in the forseeable future, cause catastrophic heating of the Earth's atmosphere and disruption of the Earth's climate. 

Moreover, there is substantial scientific evidence that increases in atmospheric carbon dioxide produce many beneficial effects upon the natural plant and animal environments of the Earth."


June 2010 - Oregon Institute of Science and Medicine 
Global Warming Petition Project (218KB)  

William Gray, PhD, Professor Emeritus of Atmospheric Science at Colorado State University, stated the following in his Apr. 7, 2010 article, "MIT Professor's Climate Change Op-Ed Proven False," available at www.globalwarmingheartland.org:

 "A high percentage of meteorologists and/or climate scientists do not agree that the climate changes we have seen are mostly manmade. Thousands of us think the larger part of the climate changes we have observed over the last century are of natural origin. I believe most of the changes that have been observed are due to multi-decadal and multi-century changes in deep global ocean currents. Such changes have yet to be properly incorporated into the global models or into most climate modelers’ thinking...

Many scientists believe a slightly warmer world would be, in general, more beneficial for humanity. The small changes in climate we have seen so far and the changes we will likely see in the coming decades are not potentially dangerous. It has been noted that vegetation growth is enhanced by higher CO2 levels...

[T]he global climate models will never be able to replicate the complex global atmosphere/ocean environment and its continuing changes...

We should all call out faulty science wherever we see it, including the blind belief (without any evidence beyond the faulty models) that humans are largely responsible for climate change."


Apr. 7, 2010 - William Gray, PhD 

Willie Soon, PhD, Physicist at the Harvard-Smithsonian Center for Astrophysics, stated the following in his Nov. 2007 article “Implications of the Secondary Role of Carbon Dioxide and Methane Forcing in Climate Change: Past, Present, and Future,” published in Physical Geography:

"There is no quantitative evidence that varying levels of minor greenhouse gases like CO2 and CH4 have accounted for even as much as half of the reconstructed glacial-interglacial temperature changes or, more importantly, for the large variations in global ice volume on both land and sea over the past 650kyr [650,000 years]. This paper shows that changes in solar insolation [amount of solar energy hitting the earth] at climatically sensitive latitudes and zones exceed the global radiative forcings [greenhouse gas accumulation in the atmosphere traping solar heat] of CO2 and CH4 by severalfold...

[T]he popular notion of CO2 and CH4 radiative forcing as the predominant amplifier of glacial-interglacial phase transitions cannot be confirmed…

Our basic hypothesis is that long-term climate change is driven by insolation changes, from both orbital variations and intrinsic solar magnetic luminosity variations. This implies natural warming and cooling variations.”


Nov. 2007 - Willie Soon, PhD 

Roy W. Spencer, PhD, Principal Research Scientist at the Earth System Science Center at the University of Alabama in Huntsville, stated the following in his Oct. 20, 2008 article "Global Warming as a Natural Response to Cloud Changes Associated with the Pacific Decadal Oscillation," available at www.drroyspencer.com:

"[W]e are finding satellite evidence that the climate system is much less sensitive to greenhouse gas emissions than the U.N.’s Intergovernmental Panel on Climate Change (IPCC, 2007) climate models suggest that it is. And if that is true, then mankind’s CO2 emissions are not strong enough to have caused the global warming we’ve seen over the last 100 years...

[M]ost of the warming could be the result of a natural cycle in cloud cover forced by a well-known mode of natural climate variability: the Pacific Decadal Oscillation (PDO). While the PDO is primarily a geographic rearrangement in atmospheric and oceanic circulation patterns in the North Pacific, it is well known that such regional changes can also influence weather patterns over much larger areas...

[R]ecent satellite measurements - even though they span only 7.5 years - support the Pacific Decadal Oscillation as a potential major player in global warming and climate change."


Oct. 20, 2008 - Roy W. Spencer, PhD 

Steven F. Hayward, PhD, FK Weyerhaeuser Fellow at the American Enterprise Instutute for Public Policy Research, stated the following in his Mar. 15, 2010 article "In Denial," available at www.aei.org:

"The models the IPCC uses for projecting a 3 to 4 degree Celsius increase in temperature all assume large positive (that is, temperature-magnifying) feedbacks from a doubling of carbon dioxide in the atmosphere...

If the climate system is less sensitive to greenhouse gases than the climate campaign believes, then what is causing plainly observable changes in the climate, such as earlier arriving springs, receding glaciers, and shrinking Arctic Ocean ice caps?...

The IPCC downplays theories of variations in solar activity, such as sunspot activity and gamma ray bursts, and although there is robust scientific literature on the issue, even the skeptic community is divided about whether solar activity is a primary cause of recent climate variation. Several studies of Arctic warming conclude that changes in ocean currents, cloud formation, and wind patterns in the upper atmosphere may explain the retreat of glaciers and sea ice better than greenhouse gases... Above all, if the medieval warm period was indeed as warm or warmer than today, we cannot rule out the possibility that the changes of recent decades are part of a natural rebound from the 'Little Ice Age' that followed the medieval warm period and ended in the 19th century."


Mar. 15, 2010 - Steven F. Hayward, PhD 

The George C. Marshall Institute, a science and public policy organization, stated the following in its July 23, 2009 publication "The Cocktail Conversation Guide to Global Warming," available at www.marshall.org:

"[G]lobal surface temperatures have not increased since about 1998. Since the late 1800s, the world’s average surface temperature is believed to have warmed about 1°F, which is, in part, a natural recovery from the 'Little Ice Age,' a period of global cooling lasting from about 1400 to the 1800s AD...

[N]atural flows of CO2 in and out of the Earth’s surface average about 20 times the human contribution...

Predictions of future climate come from computer models, which are very incomplete approximations of the behavior of the real climate system... The predictions of future climatic changes are hypotheses, not scientific facts...

Whatever the threat of climate change to humanity, it is most likely to be natural — not man-made."


July 23, 2009 - The George C. Marshall Institute 

Richard S. Lindzen, PhD, Alfred P. Sloan Professor of Meteorology at the Massachusetts Institute of Technology (MIT), stated the following in his article, "Climate of Fear: Global Warming Alarmists Intimidate Dissenting Scientists into Silence," Wall Street Journal, Apr. 12, 2006:

"There have been repeated claims that this past year's hurricane activity was another sign of human-induced climate change. Everything from the heat wave in Paris to heavy snows in Buffalo has been blamed on people burning gasoline to fuel their cars, and coal and natural gas to heat, cool and electrify their homes. Yet how can a barely discernible, one-degree increase in the recorded global mean temperature since the late 19th century possibly gain public acceptance as the source of recent weather catastrophes? And how can it translate into unlikely claims about future catastrophes?...

Global temperature has risen about a degree since the late 19th century; levels of CO2 in the atmosphere have increased by about 30% over the same period; and CO2 should contribute to future warming. These claims are true. However, what the public fails to grasp is that the claims neither constitute support for alarm nor establish man's responsibility for the small amount of warming that has occurred... It isn't just that the alarmists are trumpeting model results that we know must be wrong. It is that they are trumpeting catastrophes that couldn't happen even if the models were right as justifying costly policies to try to prevent global warming."


Nov. 30, 2009 - Richard S. Lindzen, PhD 

James M. Inhofe, United States Senator (R-OK), stated the following in his Sep. 25, 2006 speech "Hot & Cold Media Spin: A Challenge to Journalists Who Cover Global Warming,” available at www.epw.senate.gov:

"I am going to speak today about the most media-hyped environmental issue of all time, global warming…

The media have missed the big pieces of the puzzle when it comes to the Earth’s temperatures and mankind’s carbon dioxide (C02) emissions. It is very simplistic to feign horror and say the one degree Fahrenheit temperature increase during the 20th century means we are all doomed. First of all, the one degree Fahrenheit rise coincided with the greatest advancement of living standards, life expectancy, food production and human health in the history of our planet. So it is hard to argue that the global warming we experienced in the 20th century was somehow negative or part of a catastrophic trend.

Second, what the climate alarmists and their advocates in the media have continued to ignore is the fact that the Little Ice Age, which resulted in harsh winters which froze New York Harbor and caused untold deaths, ended about 1850. So trying to prove man-made global warming by comparing the well-known fact that today's temperatures are warmer than during the Little Ice Age is akin to comparing summer to winter to show a catastrophic temperature trend.

In addition, something that the media almost never addresses are the holes in the theory that C02 has been the driving force in global warming. Alarmists fail to adequately explain why temperatures began warming at the end of the Little Ice Age in about 1850, long before man-made CO2 emissions could have impacted the climate. Then about 1940, just as man-made CO2 emissions rose sharply, the temperatures began a decline that lasted until the 1970’s, prompting the media and many scientists to fear a coming ice age.

Let me repeat, temperatures got colder after C02 emissions exploded. If C02 is the driving force of global climate change, why do so many in the media ignore the many skeptical scientists who cite these rather obvious inconvenient truths?”


Sep. 25, 2006 - James M. Inhofe 

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