If a Tree Falls in the Forest, and No One Is Around to Hear It, Does Climate Change? (1 of 2) (image) National Science Foundation Share Print E-Mail Caption Forests cover nearly a third of the Earth's landmass. Falling into three categories -- tropical, temperate and boreal -- the forest types each have differing influences on local, regional and global climate. Credit Nicolle Rager Fuller, National Science Foundation Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.