Reasonable doubt is a term familiar to all of us in a courtroom context. Is it possible that, if presented with facts and a convincing argument, one could have a reasonable doubt that global warming has been caused solely by human extravagance? Allow me to present these facts and an argument.

Now for the technical jargon. the earth was evidently coming out of a relatively cold period in the 1800s so that warming in the past century may be part of this natural recovery.?This quote from Dr. John R. Christy, an atmospheric science expert from the University of Alabama in Huntsville3 sets the scene nicely. Is it possible that the earth is currently in a natural warm period due to climate cycles? Climate cycles are extremely complex and are caused for a number of reasons. These cycles include 11 and 206 year cycles due to solar variability, 21,000 year cycles due to a combination of the earths tilt and rotation around the sun, 41,000 year cycles due a 1.5% wobble variability in the earths rotation and 100,000 year cycles caused by variations by the earths elliptical orbit4. In addition to aforementioned cycles, there are a number of other factors that can influence natural climate change. These include landmass distribution and undersea ridge activity which can both affect sea levels and

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