Roman times: global warming Dark ages: global cooling Medieval times: global warming Little ice age: global cooling Present day: GLOBAL WARMING!
All I can say is thank goodness we're only about halfway through our global warming, because I don't want to be here two hundred years from now when things cool down and we go through a serious recession in life as we know it.
Oh, and I love the graph at 5:40... so incredible, do you see that huge spike in CO2 300000 years before the present!? CRAZY! Warmer Earth, more plants, more carbon life forms... more carbon dioxide? Interesting!
Humans are very good at imaging themselves to be a lot more important than they actually are, this video really makes sense to me because hey, this planet was here before we were, and it will be here long after we're gone.