Changes

Scientists such as [[Richard Lindzen]] and [[Fred Singer]] say that the patterns of global warming are naturally caused.  

Scientists such as [[Richard Lindzen]] and [[Fred Singer]] say that the patterns of global warming are naturally caused.  

In February, 2007, the [[Intergovernmental Panel on Climate Change]], an assessment group established by the [[United Nations]], released their fourth assessment report on climate change. Their Summary for Policymakers 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.