A steady rise in the temperature of the environment is known as global warming.
Global warming specifically refers to a steady rise in the temperature of the globe over the years brought about as a result of an increase in the concentration of greenhouse gases in the atmosphere.
The greenhouse gases such as carbon dioxide and water vapor form a blanket of air in the atmosphere and prevent some of the reflected sun rays from escaping back to space.
Thus, the earth gradually warms up as the concentration of these gases increases.
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