Science by utube! A brilliant source of non manipulated science! In case you can't tell, I'm being sarcastic! Your utube was funded + developed by the Heartland Institute, which in turn is funded by the extraction industries. Either you are a manipulated foot soldier of the merchants of doubt or you have some vested interest in doing their dirty work for them.

I also can't believe others haven't listed the historic drivers of climate change when you asked. I have done so with scores of AGW deniers through the years. The short list includes volcanic activity, shifts in the earth's axis, asteroid + large meteor strikes, Milankovitch cycles +, now, man's activities. Some of these can cause either global warming or global cooling. As the link I posted twice clearly shows, scientists from appropriate(there's that word again!-appropriate)fields have determined that none of the natural drivers of climate change account for this period of global warming. This leaves man's influences!