Finally, something practical

Now here we go: how to destroy the planet. Like, DESTROY it, not just kill everyone on it. Right now we're just going at it rather half-heartedly, but we're not really doing anything but some minor cosmetic damage. This is a top ten list of ways to really get rid of the whole thing. I think #2 (creating autonomous self-replicating machines) is actually more likely than #1 (pushing the earth into the sun), since you only need one von Neumann machine...