Wars are great, earthquakes, floods, fires, and tsunamis , and rising water
Non breeders....gays , leso's, trannies. Religious intolerance/beliefs. Corporate mentality.
Greed, agriculture policys, there must be more [}:)]
ban all jetskier's who travel fast [around 25knots direct upwind] thru crowded windsurfers at lucky bay yesterday.
ban all G.M seeds as well.
and all coke/pepsi cause i am not strong enough to say no.
Communism was pretty good at holding back a fair proportion of the world's human population. Now that communism is old hat, China is doing its best to get rich fast.
Perhaps the whole global warming movement will be good for the Earth as a whole as its kind of similar to communism.
Anyway I don't think the planet really cares one way or the other. Until we get another dinosaur killer comet or the sun swallows up the Earth, it will quite happily orbit the sun.
Mobydisc: sure the planet won't mind, but what about the birds, trees, fish and cuddly animals?
I held a trumpeter up to my ear once,and he had a bit to say,but i couldn`t understand it either.
I guess it comes down to whether we believe that nature has an intrinsic worth or if its only of value when humans can either exploit or enjoy it.
Whats a 20 knot seabreeze with 25 degree air temp, 22 degree water temp and a swell breaking over a sandbank 200 meters off the a palm fringed beach if there is no one there to enjoy it?
Whats of great benefit to the Planet??
My first thought was biological control of pests.
IE a virus that targets kiters. 
