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The theory of global warming has been the driving force of environmental policy reform for many years, but evidence suggests different causes for the warming, and different outcomes than expected. This controversial subject has been a topic of debate in the scientific community, and will be for the next thousand years.
The theory of Global Warming is a term used to describe an increase, over time, of the average temperature of Earth's atmosphere and oceans. Global warming theories attempt to account for the rise in average global temperatures since the late 19th century, and assess the extent to which the effects are due to human causes(Houghton). Most supporters believe that human CO2 emmisions are to blame for the warming, causing a Greenhouse Effect, while others attribute it to methane. There are also those that blame the hole in the ozone layer that "lets in more sun." The scientists do not agree on the cause, but do agree on one thing: the Earth is warming.
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