Definition
Global warming is the observed and projected increases in the average temperature of Earth's atmosphere and oceans.
The Earth's average temperature rose about 0.6° Celsius (1.1° Fahrenheit) in the 20th century.
Cause of global warming
Almost 100% of the observed temperature increase over the last 50 years has been due to the increase in the atmosphere of greenhouse gas concentrations like water vapour, carbon dioxide (CO2), methane and ozone. Greenhouse gases are those gases that contribute to the greenhouse effect (see below). The largest contributing source of greenhouse gas is the burning of fossil fuels leading to the emission of carbon dioxide.
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