[quote=Dervish]
More than a few decades, but weather patterns are getting worse. It's a combination of human activity and Earth's natural cycles that are causing it. Try as we might, anything short of completely nuking the planet entirely won't be a world-ending event. While it's possible we could kill off humanity, Earth will survive. It's been through worse extinction events than runaway pollution.
[/quote]

Well even if earth itself survives humans won't, which is the point I'm trying to get at. Environmentalism is actually a more important issue than many people think.