Changes

==The science of global warming==

==The science of global warming==

Going back thousands of centuries into the past, variations in global air temperature are closely associated with corresponding changes in carbon dioxide levels. Scientists generally believe that temperature drives carbon dioxide<ref>"High-resolution records from Antarctic ice cores show that carbon dioxide concentrations increased by 80 to 100 parts per million by volume 600 ± 400 years after the warming of the last three deglaciations." [http://www.sciencemag.org/cgi/content/full/283/5408/1712]</ref>, although some have called the data ambiguous. [http://www.daviesand.com/Choices/Precautionary_Planning/New_Data/ Davies and Company]

Going back thousands of centuries into the past, variations in global air temperature are closely associated with corresponding changes in carbon dioxide levels. Scientists generally believe that temperature drives carbon dioxide<ref>"High-resolution records from Antarctic ice cores show that carbon dioxide concentrations increased by 80 to 100 parts per million by volume 600 ± 400 years after the warming of the last three deglaciations." [http://www.sciencemag.org/cgi/content/full/283/5408/1712]</ref>, although some have called the data ambiguous.<ref> [http://www.daviesand.com/Choices/Precautionary_Planning/New_Data/ Davies and Company]</ref>

Increased concentrations of carbon dioxide and methane in the atmosphere lead to slight increases in atmospheric temperature, but the main factor is water in the form of [[water vapor]] and [[cloud cover]].

Increased concentrations of carbon dioxide and methane in the atmosphere lead to slight increases in atmospheric temperature, but the main factor is water in the form of [[water vapor]] and [[cloud cover]].