changing conditions

Current Climate Change

Global Warming and Rising CO2

Global average surface temperatures have increased markedly over the last century (Figure 1). Humans have been measuring temperature directly since the mid- 1800's; these measurements show that temperature increased by 1.33°F (0.74°C ) between 1906 and 2005, and that the rate of warming is increasing (IPCC 2007a Ch.3). The decade from January 2000 to December 2009 was the warmest decade during this time period (NASA 2011).

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