Swammerdami
Squadron Leader
1) For the most part it's the change that's the real problem--they cause ecological disruption. It looks like the warming very well might take out many of the forests in the west--the winters aren't being quite cold enough to kill off a pest that's now running rampant.
2) The extremes in both directions have left much of the Earth pretty much lifeless. Natural doesn't mean it's not apocalyptic.
This is the key point that often gets overlooked. As climate cycled over the past 2 or 3 million years, mammals migrated toward or away from the tropics in response. Untold millions of mammals suffered and died during these migrations, but who cares? That's life.
However mankind's civilization is much more precarious. Rising sea levels and droughts will affect hundreds of millions of people that our leaders are sworn to protect. The rapidity of change will be something society cannot deal with economically or politically.
At my age, 50 years from now and 5000 years from now are of about equal concern! Are any scientists predicting the very long-term effects of anthropogenic climate change? I understand that average temperatures are projected to soon exceed the highest temperatures since the Pliocene Epoch. How does ice cover compare with previous Pleistocene minima? Despite frequent mentions of "snowball Earth", periods of major glaciation are relatively rare in the Earth's long history (all occurring with less insolation than today), and are provoked and terminated by strong feedback loops. Is it possible that our declining ice cover will bring about the end of the Plio-Pleistocene Glaciation itself?