I believe that it's a problem, but I don't think that it's nearly as serious as some are making it out to be.
I think that the rise in earth's temperatures is a combination of greenhouse gases and a planet's cycle of cooling and warming.
But even if it global warming isn't a problem, humanity should still be conservationalist, end our dependancy on oil (it's not going to last forever!) and stop polluting the air, it has other effects besides contributing the the greenhouse effect.
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