Trees and global warming- location , location,location

"As Steven Milloy, guru of junkscience.com explains, forests affect the climate in three ways. They are dark and therefore absorb sunlight, which warms the planet. They also absorb carbon dioxide, which the scientists on the Supreme Court have determined is a pollutant rather than the source of all plant and, therefore, animal life on earth. But they emit water vapor, which outranks carbon dioxide as the biggest greenhouse gas of all.

According to researchers at the Lawrence Livermore Laboratory, where you plant the trees makes all the difference. Based on their computer modeling, results of which appear in the Proceedings of the National Academy of Sciences (April 17), tropical forests exert a net cooling effect. But forests above 20 degrees north latitude — a line extending roughly from southern Mexico through Saharan Africa and central India, and the Chinese island of Hainan — have a net and not insignificant warming effect."