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Fri, 10:35 16 Oct 2009 GMT17

 
The AlertNet Challenge
1 of 6

QUESTION 1
What does Columbian University expert Graciela Chichilnisky suggest might pull carbon dioxide already emitted back out of the air?
"Positive carbon"
"Negative carbon"
"Modified carbon"


URL: http://www.alertnet.org/quiz/125568913670.htm

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