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Definition of Global Warming: A gradual increase in the earthâs average surface temperature. Technical term for this: Anthropogenic global warming. Definition of Greenhouse Gas: A gas, like CO2, which traps the sunâs heat.
Global mean surface temperatures 1856-2004. Global warming is a slow steady rise in Earth 's surface temperature. Temperatures today are 0.74 Â° C (1.33 Â° F) higher than 150 years ago. Many scientists say that in the next 100â200 years, temperatures might be up to 6 degrees Celsius higher than they were before the effects of global warming were discovered. The basic cause seems to be a rise in atmospheric carbon dioxide, as predicted by Svante Arrhenius a hundred years ago.