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The World in 2050: Four Forces Shaping Civilization's Northern FutureLawson, БЂњThings Are Heating Up: Economic Issues and Opportunities from Global Warming,БЂ« CEO Confidential, Issue 2007-01, Goldman Sachs, February 8, 2007; J. Lash, F. Wellington, БЂњCompetitive Advantage on a Warming Planet,БЂ« Harvard Business Review, March 2007. 40 USCAP Press Release, БЂњJoint Statement of the United States Climate Action Partnership,БЂ« January 19, 2007, www.us-cap.org/media/release_USCAPStatement011907.pdf (accessed November 20, 2008). 41 From www.us-cap.org/about/index.asp (accessed November 23, 2008). The Web page later showed the withdrawal of several members. 42 Atmospheric CO2 variations have both natural cyclesБЂ”which fall and rise with ice ages and warm interglacial periodsБЂ”and anthropogenic sources, which are also substantial but rise much faster. Our current anthropogenic boost is perched on top of an already large natural interglacial peak, thus taking the atmosphere to levels not seen since the Miocene. Over the past 800,000 years of multiple ice age/warm interglacial cycles, including the current interglacial of the past ~12,000 years, preindustrial atmospheric CO2 levels cycled within a range of ~172 (ice age) to 300 (interglacial) parts per million by volume (ppmv) ...» |
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