Climate Change

Cover Art for 9781234424152, Climate Change by Johann Gottfried Seume
ISBN: 9781234424152
Publisher: Books LLC
Format: Paperback
Editions:
17 other editions of this product
Part of Eyewitness Books (Series)

OCLC Number: (OCoLC)123360006 Subject: Climatic changes -- Economic aspects -- United States. Excerpt: ... bodies such as the IPCC, NAS, and the Royal Academy ( the United Kingdom's national academy of science ) have concluded that human activities, including the combustion of fossil fuels, industrial and agriculture processes, landfills, and some land use changes, are significantly increasing the concentrations of greenhouse gases and, in turn, global temperatures. Although climate models produce varying estimates of the extent of future changes in temperature, NAS and other scientific organizations have concluded that available evidence points toward continued global temperature rise. Assuming continued growth in atmospheric concentration of greenhouse gases, the latest assessment of computer climate models projects that average global temperatures will warm by an 10 additional 1.8 to 4.0 degrees Celsius during the next century. Some scientists have questioned the significance of the earth's present temperature rise relative to past fluctuations. To address this issue, the NAS recently assessed the scientific community's efforts to reconstruct temperatures of the past 2,000 years and place the earth's current warming 11 in an historical context. Based on its review, the NAS concluded with a high level of confidence that global mean surface temperature was warmer during the last few decades of the twentieth century than during any comparable period during the preceding 400 years. Moreover, NAS cited evidence that temperatures at many, but not all, individual locations were higher during the past 25 years than any period of comparable length over the past 1,100 years. 10 IPCC narrowed its range of projected warming in its recently released summary from the corresponding range of 1.4 to 5.8 degrees Celsius reported in the 2001 Third Assessment Report. Although these two sets of projections are broadly consistent, they are not directly comparable. IPCC notes in ...

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