Environmentalists argue that the science is well established and that any action taken to prove otherwise will be fruitless. They do this to divert public attention from the fact that much of their data is purposely taken out of context, manipulated or invented to prove the existence of human-caused global warming. In fact, there is more evidence to show that rising temperatures may be due to solar activity or part of the Earth's natural climate fluctuations, rather than arguing that it is caused by human-generated greenhouse gases. The global warming debate encompasses one of the most complex systems in our natural world, the Earth's atmosphere, so it is very important to understand the basics. In the book The Science and Politics of Global Climate Change, climate is defined as “The climate of a place, of a region, or of the Earth as a whole, is the average over time of the weather conditions that occur there – the mean weather” . (Dessler & Parson, 2010, p. 7). The source of energy for the Earth's climate is electromagnetic radiation, more specifically the sun. This means that the sun is the main driver of the climate, unless something else acts on it. According to environmentalists, humans are changing the climate through our actions. The official definition of man-made climate change is given by the United Nations report “Framework Commission on Climate Change”, as “climate change attributed directly or indirectly to human activity which alters the composition of the global atmosphere and which is also to natural climate variability observed over comparable time periods” (Bell, 2011, p. 45). According to environmentalists, the main way humans are changing the climate is through the greenhouse effect. The green... in the center of the card... has been suppressed by the Environmental Protection Agency. Carlin, who was a senior research analyst at the EPA, wrote their “Internal Climate Study” report. After reviewing all the research compiled by the EPA, it concluded that the available data invalidated the theory of human-caused global warming. He wrote: “Given the downward trend in temperatures since 1998, there is no particular reason to make a hasty decision based on a scientific hypothesis that does not appear to explain most of the available data” (Bell, 2011 , p. 9). Because of his findings, Alan Carlin, a thirty-eight-year-old employee, was banned from telling anyone about his report and was removed from any climate-related job. Shortly after the report was suppressed, the United States enacted the hazard declaration in the Clean Air Act that allows it to set limits on greenhouse gases produced by the American people.