Changes

In February, 2007, the [[Intergovernmental Panel on Climate Change]], a body of climate change scientists<ref>http://www.chicagotribune.com/news/nationworld/chi-0704280477apr29,1,4275902.story?coll=chi-newsnationworld-hed</ref> established by the [[United Nations]], released their fourth assessment report on climate change. That report concluded that recent global climate change was "very likely" caused by human activity, <ref>http://news.bbc.co.uk/2/hi/science/nature/6321351.stm</ref>.

In February, 2007, the [[Intergovernmental Panel on Climate Change]], a body of climate change scientists<ref>http://www.chicagotribune.com/news/nationworld/chi-0704280477apr29,1,4275902.story?coll=chi-newsnationworld-hed</ref> established by the [[United Nations]], released their fourth assessment report on climate change. That report concluded that recent global climate change was "very likely" caused by human activity, <ref>http://news.bbc.co.uk/2/hi/science/nature/6321351.stm</ref>.

Politicians who support the [[Kyoto Protocol]] have made the claim that there is a cause and effect relationship between increases in atmospheric concentrations of [[greenhouse gas]]es and air temperature.

Politicians who support the [[Kyoto Protocol]] have made the claim that there is a cause and effect relationship between increases in atmospheric concentrations of [[greenhouse gas]]es and air temperature.{{fact}}

Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6&nbsp;°C [1.0&nbsp;°F] in the past three decades and 0.8&nbsp;°C [1.4&nbsp;°F]in the past century." <ref>http://data.giss.nasa.gov/gistemp/2005/</ref>

Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6&nbsp;°C [1.0&nbsp;°F] in the past three decades and 0.8&nbsp;°C [1.4&nbsp;°F]in the past century." <ref>http://data.giss.nasa.gov/gistemp/2005/</ref>