Low graphics   |   Mobile      Login   |   About us      
Fri, 10:22 16 Oct 2009 GMT17

 
The AlertNet Challenge
1 of 6

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


URL: http://www.alertnet.org/quiz/125568759555.htm

For our full disclaimer and copyright information please visit http://www.alertnet.org