G2010-004 Global Temp 2009-MPEG1_512x288.mpg
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Climate scientists at NASA’s Goddard Institute for Space :::Studies or GISS just released a new analysis of global average :::temperatures showing that 2009 was tied as the second warmest:::year ever recorded. And looking just at the southern hemisphere:::2009 even broke the record as the warmest year ever :::ever in this half of the world. In fact 2009 was :::virtually tied with 5 other recent years in its position as second :::warmest on record, 1998, 2002:::2003, 2006, and 2007:::and was only a fraction of a percent cooler than the warmest year, 2005.:::Yet when looking at global temperatures over a longer timeframe:::these scientists found a persistent warming trend over the past:::three decades, with the average global temperature increasing by:::roughly a third of a degree Fahrenheit per decade. This past decade, :::from 2000 to 2009, was the warmest yet.  :::And when looking back all the way to 1880, the year when precise :::temperature record keeping began, scientists observed about a one and a half :::degrees Fahrenheit rise in global temperatures. ::: [QUOTE: Jim Hansen] “There are :::already beginning to be effects of 1 or 2 degrees warming and:::if we get 5 or 10 degree warming several decades:::down stream there will be huge effects.”  GISS scientists came:::came to these results after analyzing information from three sources:::data from more than a thousand weather stations around the globe, satellite:::observations of sea surface temperature, and measurements from Antarctic research:::stations. So what’s the cause of this long term warming trend? :::While there are several natural processes that can cause subtle climate warming :::or cooling, like variations in solar activity, fluctuations:::in ocean currents, and volcanic eruptions, climate scientists:::believe that rising levels of carbon dioxide and other greenhouse gasses:::are the dominant factor driving the rise.:::[QUOTE: Jim Hansen] “If we want to limit:::climate change and keep it under :::an additional one degree Celsius or 2 degrees Fahrenheit:::we would need to begin to decrease the CO2 :::emissions gradually so that by the end of the :::century CO2 stopped increasing.” So while 2009’s :::temperature may not have been the global record breaker, it is in:::line with the long-term trend telling scientists that the planet is getting warmer.:::
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