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== Scientific background ==
== Scientific background ==
[[Image:Co2 concentration.gif|thumb|right|Graph of CO2 concentration from 1900 to 2000<ref>http://www.oism.org/pproject/s33p36.htm</ref>]]
The theory of climate change concerns many varied factors, but one of the most commonly cited is that of 'the [[greenhouse effect]].'
The theory of climate change concerns many varied factors, but one of the most commonly cited is that of 'the [[greenhouse effect]].'