Global Warming Essay

990 WordsAug 30, 20144 Pages
Global warming is the observed century-scale rise in the average temperature of Earth's climate system. Since 1971, 90% of the increased energy has been stored in the oceans, mostly in the 0 to 700m region. Despite the oceans' dominant role in energy storage, the term "global warming" is also used to refer to increases in average temperature of the air and sea at Earth's surface. Since the early 20th century, the global air and sea surface temperature has increased about, with about two-thirds of the increase occurring since 1980. Each of the last three decades has been successively warmer at the Earth's surface than any preceding decade since 1850. Scientific understanding of the cause of global warming has been increasing. In its fourth assessment of the relevant scientific literature, the Intergovernmental Panel on Climate Change reported that scientists were more than 90% certain that most of global warming was being caused by increasing concentrations of greenhouse gases produced by human activities. In 2010 that finding was recognized by the national science academies of all major industrialized nations. Affirming these findings in 2013, the IPCC stated that the largest driver of global warming is carbon dioxide emissions from fossil fuel combustion, cement production, and land use changes such as deforestation. Its 2013 report states: Climate model projections were summarized in the 2013 Fifth Assessment Report by the Intergovernmental Panel on Climate Change . They indicated that during the 21st century the global surface temperature is likely to rise a further for their lowest emissions scenario using stringent mitigation and for their highest. The ranges of these estimates arise from the use of models with differing sensitivity to greenhouse gas concentrations. Future climate change and associated impacts will vary from region to region around the

More about Global Warming Essay

Open Document