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The current issue of Scientific Americanhas this artcle: Methane, Plants and Climate Change:

http://www.sciam.com/article.cfm?chanID=sa006&colID=1&articleID=1367E15B-E7F2-99DF-346DBF33877B8596

It begins telling how a big discovery about the contribution of the earth's plant life contributes huge amounts of methane, a big player in greenhouse effects. However, this article manages to minimize plant's (including algae) contribution when compared to man's. However, the following article in National Geographic says that the plant contribution cannot yet be measured. Here is that article:

http://news.nationalgeographic.com/news/2006/01/0111_060111_ plant_methane.html

Another Russian scientist has found that temperatures cause an increase in CO2. Could these increased temperatures accelerate plant growth? However the increase in CO2, the following post in Free Republic gives a departure from the dogma.

In short, the Chicken Littles have yet to answer is it the chicken or the egg: does temperature cause increased CO2 or does increased C02 cause increased temperature?