I do know that we seem to have an ice age every 10,000 years - give or take a few.
I also know that the ozone layer is depleting because of the use of CFCs and all that other shit we put in the air.
I would also journey a wild guess that this would probably be the first time in history that humans have actually buried tons and tons of waste that takes thousands of years to decompose.. and has polluted the water with our own fecal matter, along with chemical pesticides and fertilizers, not to mention the choice to use, exclusively, a fuel which we knew nothing about the source from which it came. (That would be oil and natural gas- fossil fuels)
We have absolutely done far more damage in the past 100 years, than in the entire history of the world.
So regardless of whether we are cooling right now, or warming up- I have all systems glowing green for GO for 100% sustainable energy, and waste reduction.
Such blissful ignorance...