WSJ: Are Humans Responsible for Climate Change?

Wow, the results of this WSJ poll was surprising:

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Human cause
chart courtesy of WSJ

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And they teed up the poll with this description:

This decade is on track to become the warmest since records began in 1850, and 2009 could rank among the top-five warmest years, the U.N. weather agency reported on the second day of a pivotal 192-nation climate conference.

What do you think is causing the warm-up?  Is it human activity on the planet, or a natural cycle?

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Source:
Current Decade on Track to Be Warmest on Record
Associated Press
WSJ, DECEMBER 8, 2009
http://online.wsj.com/article/SB126027972598681805.html

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