“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.”