Do you think the greenhouse effect or any other man induced impact could kill all life on earth?
I have to agree with (most of) the others. IMO, even if man deliberately tried to, he would find it impossible to destroy all life on earth. Climate change and similar man-initiated catastrophes WILL seriously impact biodiversity, but mostly of larger animals and plants (a bit like the dinosaur extinction, as you suggest). In fact, the dinosaur extinction event (The “K-T extinction”) was not the largest mass extinction in history. There are 5 recognised mass extinctions, and the K-T is just the most recent (65 million years ago). The largest is the P-Tr (“Permian-Triassic”) event, 250 million years ago, which wiped out 96% of all aquatic animals and 70% of all land vertebrates – and is the only known mass insect extinction. By contrast, the K-T extinction killed-off “only” about 50% of organisms.
