In case anyone has any doubts about the reality of global warming, check out this website with official NASA data regarding global warming. The charts are quite graphic in their depictions of the evidence of global warming. Despite what the delusional right is saying about emails and other such nonsense, the reality of global warming is more obvious than it ever has been.
The physical realities of global warming
Thursday, 26 November, 2009
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Over the past 25 years, global temperature has warmed at a rate of ~0.2°C per decade. Superimposed over this long term trend is short term variability. Most of these short-term variations are due to internal oscillations like El Niño Southern Oscillation, the 11-year solar cycle and volcanic eruptions. Over periods less than a decade, such short-term variations can outweigh the anthropogenic global warming trend. For example, El Niño events can change global temperature by up to 0.2°C over a few years. The solar cycle imposes warming or cooling of 0.1°C over five years. However, neither El Niño, solar activity or volcanic eruptions make a significant contribution to long-term climate trends. Consequently, over the past decade (1999-2008), the warming trend is 0.19°C per decade. consistent with the long term trend.
Figure 2: Global temperature according to NASA GISS data since 1980. The red line shows annual data, the red square shows the preliminary value for 2009, based on January-August. The green line shows the 25-year linear trend (0.19 °C per decade). The blue lines show the two most recent ten-year trends (0.18 °C per decade for 1998-2007, 0.19 per decade for 1999-2008).
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