As an armchair environmentalist, I know that the Earth will survive. Humans might die off, but it's survival of the fittest at work. Yes, it is harsh, but humans are unbalancing the system. Maybe it is CO2 from power plants and cars. Maybe it is CO2 from 6 billion humans. Maybe it is due to the fact that we are cutting down trees and natural wooded areas. Maybe it is because there are 6 billion humans who are all giving off heat at 98.6 F.
It seems like everyone is looking at the past to predict what will happen in the future. 450 million years ago, if the planet was hotter, it wouldn't matter. There wasn't billions of people that would die if the crops wouldn't grow. If the temperature goes up a few more degrees, would we be able to adapt? Would the rest of the animals be able to?
The "Mass Balance" of Antarctica will definitely be positive right now, it is winter there now.
But, what happens if the North Pole melts? Will there be more rain, storms, and wind? Will major cities flood?
While the scientists might be a little too active and alarmist. The right-wing politicians and businessmen are way too passive, and don't care because they are safe regardless.
I'm still concerned much more about other air pollution and water pollution (Although it is better now than in the past).