We think everyone else will be more affected than we ourselves will.
We somehow think plants and animals will be way more affected than people...as though we don't all rely on the same resources.
The comments on the Treehugger post do bring up some valid points...well, of course, future generations will be more affected than than us, and of course developing nations will have more trouble staving off impending doom than richer nations.
But I don't think you can explain the responses away as rationally as all that. People are sometimes just as irrational as they seem!