China has surpassed the U.S. as the world's largest investor in clean-energy technologies.  Italy, Brazil and Germany are ranked third, fourth and fifth, respectively. Certain countries are increasing their investments faster than others, however, regardless of raw dollars. A few are declining, too.

Percent Increase in New Clean Tech Investment, 2009 to 2010

Country Increase
Mexico 273
Italy 207
Austrailia 119
Canada 56
U.S. 51
China 39
Belguim 35
India 21
Germany 20
Brazil -1
Spain -56
U.K. -73


Source: Bloomberg New Energy Finance