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Author: WuLong Big gold star, 5000 posts Old School Fool Add to my Favorite Fools Ignore this person (you won't see their posts anymore) Number: of 212840  
Subject: Re: OT-Keystone XL Pipeline Date: 2/4/2013 2:36 PM
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1. Is global warming real?
Yes.
a. whatever the cause, has the planet's temperature gone up over the last N years?
roughly .75C over the last 100 years.
b. What temperature are we talking about? Average over the whole earth? Average over all land? Over habitable land?
That's for Earth as a whole. There are some regional variations.

2. Are there scientific reasons to suspect that global warming is bad?
All change entails risk. Good and bad are relative. In general, and to a point, warmer temperatures are beneficial to Mankind. That said, if melting ice caps result in significant sea level changes, the result would be migration/relocation, which has costs.
The real question is how quickly change occurs and how long people have to adapt.

Your other questions enter the realm of politics. There are other venues for such discussions.
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