People die natural deaths. So murder can't exist? Featured
Notes: 'It's happened in the past, from natural causes.' is one of the most popular arguments used by climate skeptics and deniers, with the implication that because the climate has changed throughout earth's history, that let's us 'off the hook.'
But the historical record actually teaches the opposite lesson. As scientists have learned more and more about past climate changes, they have become increasingly convinced that human activity is driving warming now. The physics are the same. The closer you look at the past, the clearer you can distinguish the 'human fingerprint' on current warming.
For a brief summary of all the 'human fingerprints' -- the observable evidence that indicates human causality of current warming -- see The Scientific Guide to Global Warming Skepticism. For further discussion see Richard B. Alley's Earth: The Operators' Manual.
Bite Source: Richard Alley, Climate Change: Interactions and Implications, CLEAN workshop, June 7, 2011.
Image Source: here
October 22, 2011