As the future of the tropics unfolds, scientists must explain the dimensions and mechanisms of forest responses to rapid human-population increase and environmental changesAs human populations and their impacts on the world increase, tropical forests are changing in many different ways. Forests are being cleared, burned, logged, fragmented, and overhunted and an unprecedented pace, and they are also being altered in insidious ways by global climatic and atmospheric changes. "The evidence for global effects suggests that a massive reorganization of the structure and dynamics of tropical forests is already underway" writes ecologist S. Joseph Wright, "The tropics support over half of all species and over two-thirds of all people. Without an appropriate commitment from the scientific community, the two are unlikely to continue to coexist," concludes the scientist.