Fark, in a remarkable departure from Boobies and Weirdness, linked up this story about one scientist's theories behind the Devonian mass extinction event. This event was before the better-known Permian and Cretaceous events, but still managed to off about 70% of the earth's species at the time. The theory is that land plants, which evolved in the Devonian, created unique land/sea conditions that wrecked the finely balanced ecological conditions of the oceans of that period. In other words, the trees did it.