what is global change

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What is global change? Last updated 01 November 2004 Originally answered 1 November 2004 Full Question What is the definition of “global change?” Answer According to the U.S. Global Change Research Act of 1990, global change is defined as: “Changes in the global environment (including alterations in climate, land productivity, oceans or other water resources, atmospheric chemistry, and ecological systems) that may alter the capacity of the Earth to sustain life.” The U.S. Global Change Research Act of 1990 is the public law that established the U.S. Global Change Research Program (USGCRP) and the U.S. Global Change Research Information Office (GCRIO). A Physical Scientists' Perspective of the Human Dimension of Global Change John E. Lewis and Eric C. Wood [The following presentation was initially offered as a keynote address at the Second International Congress of Arctic Social Sciences, (ICASS II) Rovaniemi, Finland, 1995. It was published in Unity and Diversity in Arctic Societies , in 1996 by the International Arctic Social Sciences Association. Reprinted with permission of the authors and publisher.] Introduction and Preamble Over forty years ago, C.P. Snow expressed concern over the separation of the two scientific cultures - the natural and the social - and urged for more coop eration in their research. Now, more than ever, there is an urgency to bring the two together. However, problems exist when trying to foster cooperation mainly on questions of the underlying scientific paradigms and the testing of proofs. These factors have traditionally separated the two cultures. The root of the conflicts arises because, as Blaikie (1985) puts it, "both sets of disciplines tend to have different conceptions about the domain and status of proof in the pursuit of knowledge....". The main

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