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A Case for CO2 as the main cause of Global Warming

I have a confession to make. I have never seen Al Gore's movie, but I just couldn't pass up writing this article. The subject of climate change and global warming are too important. Is Al gore an alarmist? This is not a good question. A better question is: Should we be alarmed by the evidence of greenhouse gases causing global warming. Instead of whether Al Gore's movie is relevant or not, a better question is: Is global Warming caused by Human Activity or Natural Phenomena?"

The climate effects human activity and much of the other life on this planet. I believe that greenhouse gases resulting from human activity are effecting climate change. I would say that there is a strong probability that this is the case, because the evidence indicates it. Because most of us are not actively involved in climate change research, we really need to listen to the people that study the climate change phenomena and try our best to understand what they have found and not be prejudiced by our own feeling on the subject.

It has been proposed that solar variations are responsible for the warming of the earth. Solar cycles and volcanism are the major causes of climate change throughout much of the earths history, but there just isn't any evidence for solar heating over later half of the 20th century. Evidence has shown that there has been a cooling of the stratosphere since 1960. In fact, there is evidence that the amount of sun light reaching the surface of the earth in the last half of the 20th century has been decreased due to global dimming or particulate matter in the atmosphere from human activity. The most comprehensive study done to date by the Hadly Center in the united Kingdom showed that solar variations were responsible for warming in the first half of the 20th century, but that greenhouse gases were responsible for most of the climate change since 1980. The study model was revised in 2003 and this new model showed that natural forcing or a combination of solar radiation, volcanic activity accounted for between 16% and 36% of the global warming trend. The rest of the trend was accounted for by greenhouse gasses, and that continued greenhouse gasses emissions would cause further rise in global temperatures.

In past ages, the earth had moved closer to the sun in its orbit or the earth had tilted on its axis. Also in the past, increases in volcanism is thought to have caused climate change. Scientists have also looked these

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