Apparently biologists are split as to if humans or climate change killed off prehistoric creatures like like mammoths, giant sloths and saber-toothed cats. These creatures known as megafauna all died out at about the same time early in human history. In this interesting clip professor Elizabeth Hadly gives an overview of the debate which can be seen in full here.

Above: The Giant Sloth looks like a cute creature from Star Wars, no?

One way to stop climate change is if everyone suddenly gives up on fossil fuels — however that notion might not be realistic given the political realities. However it begs the question if we should be getting much more serious about geoengineering which is the concept man made intervention to prevent climate change. In this video atmospheric scientist Ken Caldeira asserts that this may be the only realistic way to prevent climate change — and given what we’ve seen the politicians do (or not do) he may be correct.