Considering major oil companies like Exxon buried their own studies in the 70's showing that this was going to happen, there was a lot we could have done back when small changes would have been easy. Now we're fucked -- it's going to hurt everyone to make the changes needed, and the effects of climate change that we can't stop are going to hurt even more -- but hey it's ok because the big corporations made their money and too bad for the rest of us. We're not on the brink of extinction yet, but I'm betting life in another 50-100 years is going to be unrecognizable to what we were used to in the 80's.