I admire Indur Goklany, who is my go to guy on human effects and catastrophic environmental events.
There is no one to compare to in his area of expertise. He can tell you the human effects of all the matters of climate and environmental concern, and show that things are better and there is nothing to be afraid of–humans will do well if the climate warms and have had progressive improvements for a long time.
Indur is like Julian Simon–he debunks the scaredy cats. All the time.