Why not try googling it? I'm sure you knew something about global warming before posting the question here.
What surprises me about global warming is that some people deny that it's human-created, rather that it's a natural process. Now that's possible that there are cyclical forces at work too, but it shouldn't give us an excuse to forget about changing our ecological footprint. We have a lot of changes to make in how we interact with this planet and it's resources, and I think we need to come into common acknowledgment of this as a start.
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