There's always The Voluntary Human Extinction Movement. I actually agree with Bladen to a point; human population left unchecked and spiraling out of control will inevitably lead to a cataclysm of immense proportions. However I'm not sure a mass cull is necessary quite yet.
That said, nobody can be held responsible for their own birth, or for the evolution of their forefathers and this raises interesting questions about how liable we can be held, individually or collectively, for ruining the planet. 'Antinatalist' philosopher David Benetar's seminal work Better Never To Have Been: The Harm of Coming Into Existence explores these troubling conundrums in more detail.
P.S Sorry, I didn't realise this was the Weather thread