Kasz216 said:
Indeed. The difference is that people who support anthropogenic global warming greatly underestimate the amount of greenhouse gases that are produced natuarally. At one point it's even been suggested that manmade greenhouse gases are somehow "worse" then regular gases despite having the same atomic structure to explain this. People just don't talk about it anymore though. I think of it like being on a sinking ship. Sure you could of left the faucet on... and that is going to stop the bathroom from flooding... but your ignoring the huge hole in the wall.
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Its the straw that breaks the camels back. Humans are undoubtably increasing the amount of greenhouse gasses significantly (http://en.wikipedia.org/wiki/Greenhouse_gasses#Natural_and_anthropogenic).
Manmade ones are only worse than natural ones because they are the ones that are upsetting the balance that has been around for at least the past 10,000 years (which has been a period of extreme environmental stability).