I am. I wrote "We Need Zero Sum Pollution Now" a few years ago, exactly for this reason. And Pollution, of air, water and FOOD does indeed threaten. But, man's "expansion," while certainly threatening to some species (That darn old snail darter, or the desert insect so highly valued) are just flash points for environmentalists, not real substance in the discussion. The problem is, who makes the judgement call? Once someone, anyone, can say with real or imagined certainty "that species has no value, or whatever hasppens, happens, since nature does the same thing hundreds, even thouands of times a week," does that make man a more threatening possiblity than Nature? Riddle me that!
However, rather than treating each and every extinction possibility as a catastrophic event, I would hope that reasonable people could reach common ground; ground rules would help! Maybe each and every event is the "slippery slope" environmentalists fear...maybe not.
Read the Article at HuffingtonPost