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Harold A. Mooney and Richard J. Hobbs At present there is enormous concern about the changes that are occurring on the surface of the earth and in the earth's atmosphere, primarily as a result of human activities. These changes, particularly in the atmosphere, have the potential for altering the earth's habitability. International pro­ grams unprecedented in scope, including the International Geosphere­ Biosphere Program, have been initiated t...

Changing patterns of global commerce are leading to the breakdown of biogeographic barriers that have historically kept the floras and faunas of different continents separate. Some introduced species not only take hold in their new foreign habitat but also become aggressive, these -- invasives -- can exact a serious toll on ecosystem diversity and processes. Global changes -- including changes in atmospheric composition, land use patterns, and...