is the observed increase in the average temperature of the Earth's atmosphere and oceans in recent decades and its projected continuation into the future.
Global average near-surface atmospheric temperature rose 0.6 ± 0.2 °Celsius (1.1 ± 0.4 °Fahrenheit) in the 20th century. The prevailing scientific opinion on climate change is that "most of the warming observed over the last 50 years is attributable to human activities" [1].
The main cause of the human-induced component of warming is the increased atmospheric concentration of globalwarming awareness2007 such as carbon dioxide (CO2). This leads to warming of the surface and lower atmosphere by increasing the greenhouse effect. Greenhouse gases are released by activities such as the burning of fossil fuels, land clearing, and agriculture.
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