This 1999 synthesis summarises the international research effort in the Global Change and Terrestrial Ecosystems (GCTE) Core Project of the International Geosphere-Biosphere Programme. Five major thematic areas are covered: ecosystem physiology; ecosystem structure and composition; terrestrial production systems; global biogeochemistry; ecological complexity (biodiversity). A summary of the integrated and interactive effects of global change on the terrestrial biosphere for four key regions of the world is presented, as well as a projection of future trends in the terrestrial component of the global carbon cycle. The book also includes a section on tools developed or modified for global change research.