Warren seems to have a some fixation about the "worth" of the earth. Worth is a human concept. Without humans, the question becomes moot. What's the worth of any rock in this solar system? Ceres cares not what it's worth. Sedna cares not what it's worth. It's a silly argument, IMHO. The question reduces to removal of humans from earth. The idea that the entire planet might disappear along with the humans doesn't really matter in the "worth" equation.
Would anyone care to provide some numbers on the chance that we, humans, wipe out the entire race by an all out nuclear or biological, or chemical, or combination war, compared to the worst case scenarios of the LHC? My gut feeling says that the chances of things going horribly wrong with nuclear weapons, or other weapons, are much worse than us getting physics so utterly wrong that the LHC might do something horrible. If that is indeed the case, any person supporting any nationalistic view might cause more danger than any scientist working on the LHC. Even if the actual danger caused is still close to non-existant.
