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There are other points to consider about the correlation between carbon dioxide and global warming. Because of natural incidents such as volcanoes and geysers, it is impossible to even try to demonstrate that changes in CO2 levels are human-made because these two natural occurrences emit water vapor, another greenhouse gas. The evolution of rises in carbon dioxide must be shown to be historically true and accurate. This cannot be accomplished due to the fact that there were no accurate tools for even crude temperature analysis thousands of years ago. There is no model that can make accurate predictions of the past, including predictions regarding atmospheric upper-level temperatures. Any model that is unable to match past data must be labeled as incorrect (“Man Caused Global Warming Scientific Fact?”, 2006).

These are a few, of many, reasons as to why we cannot truly say with any certainty that man-made CO2 has any serious effect on the climate. The earth's atmosphere is an open system with many confounding variables impacting the data. The only true fact that can be deduced is that the variables of temperature and carbon dioxide levels share a correlation, not causation, relationship.

Causes Of Global Warming

If man-made CO2 emissions are not responsible for the gradual, and relatively minuscule, increase in the world's temperature, then what is? It seems few people take into account three very essential factors; deforestation, climate cycles, and radiation, all of which are imperative when analyzing the theory of warming. For example, when studying climate change, it is evident that thousands of factors beyond CO2 must be considered. Also, we must consider where CO2 comes from, such as from the increases of deforestation. Furthermore, radiation is just one more factor that scientists consider when analyzing climate change.

Climate cycles are largely responsible for the changes in the earth's temperature. The earth's climate has always moved in cycles, suggesting that at any point it is getting warmer or cooler with cyclical changes (Botkin, 2007). We are indeed going through a warming period at present, but this has happened before. During the High Middle Ages, from roughly 850-1250 A.D., there was a major increase in global temperature, where it was actually warmer then than it is now (Watson, 2007). The evidence for this is obvious. For one thing, Iceland and Greenland were both inhabited by Vikings. In fact, not only were these Norsemen able to live on these islands, but they were also able to farm and raise livestock, as recent archeological studies show (Mandia, 2000). Also, obviously due to more temperate weather, England could at that time efficiently grow wine grapes, which could not pragmatically be done either before that period or even today (Gardiner, 2007). The Arctic Sea Ice shows very obvious signs of having melted during that period. Geolog本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。