Hint: It’s a trick question. This is a very good essay on the question of warming and warming peaks over a geologic time scale. Two items to take away from it: first, of the various warming periods since the end of the last glaciation, the one with the highest “peaks” was the first, roughly 7,500 years ago. Where was all that human-generated CO2 then? Second, from that first warming peak, all the subsequent warming periods (Roman Warming, &c.) have had successively lower peaks. In other words, they’re warming, but less and less an less… Well worth reading.
There have been a number of statements made recently about “Global Warming Deniers”, e.g. “White House: Global Warming Deniers Wrong to Reference Polar Vortex” US News, “Watch The Daily Show mock Trump and other global warming deniers” The Week and “Global warming denier Jim Inhofe: ‘Fewer and fewer’ senators believe in climate change ‘hoax’”. The Raw Story
Given the apparent prevalence of “Global Warming Deniers”, it seems prudent to take a look at the data so that everyone is clear when Global Warming began and what is undeniable. As such, from the following EPICA Dome C Ice Core record from Vostok, Antarctica, over the last 450,000 years Earth has experienced numerous Glacials, commonly referred to as Ice Ages, and Interglacials, like the Holocene Interglacial we are experiencing today:
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