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A lot of the scientists like to believe humans have a huge effect on the world and that everything else in the universe stays the same. I find it kind of funny that scientists predicted more Katrina like hurricanes and there haven't been any, more heat waves and then it snows in Pakistan and San Diego. The sun (that big yellow ball in the sky) has more impact on earth than humans do and also the orbit of the earth (no it doesn't stay the same).