Global warming is the increase in t

Global warming is the increase in the average temperature of the Earth's near-surface air and oceans since the mid-20th century and its projected continuation. The Intergovernmental Panel on Climate Change (IPCC) concludes that increasing greenhouse gas concentrations resulting from human activity such as fossil fuel burning and factories.
Carbon dioxide is not the only gas released by human activities that can cause warming. Human emissions of methane and nitrous oxide together contribute almost half as much warming. The main cause of the hole in the ozone layer is chlorofluorocarbons (CFCs), gases that are used in refrigerators, air conditioners, and industrial applications. While CFCs alone cause warming, their ozone destruction can cause cooling. So far these warming and cooling influences have approximately balanced.

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global warming is the increase in the average temperature of the earth's near-surface air and oceans since the mid-20th century and its projected continuation. the intergovernmental panel on climate change (ipcc) concludes that increasing greenhouse gas concentrations resulting from human activity such as fossil fuel burning and factories.
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