A lack of perspective
The very worst man-made global warming scenarios won't raise the earth's temperature more than it was during the time of the dinosaurs. We might not survive (possibly a good thing), but life surely will.
Where were these aliens 65 million years ago when a meteorite took out the dinosaurs and most life on earth? Where were the aliens 250 million years ago when the formation of Pangea caused massive volcanism, the release of greenhouse gases far exceeding anything we can do today, and the near total extinction of all life on earth? Where were they when when the earth turned into a snowball? Where were they 2.5 billion years ago when cyanobacteria showed up and started churning out oxygen, killing all previous life on earth? Just what life do they favor, anyway?
It amazes me that someone could reach the lofty status of post-doc and not have a clue about the natural history of our earth. Just what do they teach in graduate school? If they guys are so over-specialized that they don't have time for basics, just what good are they????