Physicist at the Harvard-Smithsonian Center for Astrophysics
Con to the question "Is Human Activity Primarily Responsible for Global Climate Change?"
"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."
“Implications of the Secondary Role of Carbon Dioxide and Methane Forcing in Climate Change: Past, Present, and Future,” Physical Geography, Nov. 2007
Experts Individuals with PhDs, heads of government, members of federal legislative bodies, and individuals with graduate degrees and significant post-graduate involvement in fields relevant to the study of climate. [Note: Experts definition varies by site.]
Involvement and Affiliations:
Physicist, Solar, Stellar, and Planetary Sciences Division, Harvard-Smithsonian Center for Astrophysics
Astronomer, Mount Wilson Observatory
Chief Science Researcher, Center for Science and Public Policy
Chief Science Advisor, Science and Public Policy Institute
Senior Scientist, Marshall Institute
Science Director, Tech Central Station
Global Warming Expert, Heartland Institute
Receiving Editor, New Astronomy
Member, American Astrophysical Society, American Geophysical Union, and the International Astronomical Union
Recipient, Peter Beckman Award, Doctors for Disaster Preparedness, 2004