Our very existance today causes global warming. Your heat, electricity, mode of travel, almost everything we do causes some form of pollution that is emitted into the atmosphere. If humans didn't exist we would have rain forests, and no factories dumping pollution into the air. Human existance can't balence out the amount of pollution that plants and trees take care of. Just our breathing is killing our planet. Let that sink in a minute, we're killing our own planet. :/ And in an effort to make money we're killing what few forests we have for lumber. Just take a look at global warming in the last fifty years... and you'll see.
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