The climate has changed throughout Earth's long geologic history. However, it has always changed in response to something. The Permian extinction and wild climatic swings, were caused by massive volcanic eruptions in what we now call Siberia. An ice age was triggered by the isthmus of Panama closing off the equatorial ocean current. Droughts in Africa were caused by the last ice age...and today's changing climate is also being caused by something...scientists whose life's work is to study this know what it is. Every world leader (except for one) knows what it is. There are a shrinking number of people who want to blame natural factors, and disregard the gigatones of CO2 & Methane we have been emitting - it is certainly their choice to do so. And just a note about those who equate understanding Anthropogenic Global Warming with liberal views...it is really only the political right in the USA (and nowhere else) that fights all facts, research and action on this issue.
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