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I believe the scientist. I know it doesn't matter to some here. My arguement is "what if you are wrong?"
If you are wrong, global warming could be a real threat, and if severe enough could threaten extinction of some to many (or all?) species on our ONLY planet.
If the scientists are wrong we'll have "wasted" money building more efficient transportation, less polluting industries, spent more time walking or biking on short trips, carpooled or limited the number of trips unneccesarily to save gas (and money). Etc, etc, etc..
I know it's an over simplification of the problem. But where we can easily lower CO2 emmissions-we must (and why not?), where it is hard to lower-we must try and where it seems impossible-we should try something...
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