​And while we’re on the subject ...... 

As we surely, albeit slowly, slide into another ‘greenhouse’ epoch in Earth’s history it is interesting to ‘know’ that Antartica was once warm and forested. Shackleton found coal seams as well as fossilised wood and leaves. And since then the list of fossil finds in Antarctica have been dated to between 40 and 100 million years ago when Antarctica was pretty much in the same location, relative to the equator, as it is today. At that time at the other pole, the Arctic Ocean was a great freshwater lake infested with crocodile-like reptiles. [New Scientist June 2008]
Whatever position you take on the human contribution to ‘climate change’, this is a little more food for thought.