Climate change: a change in global or regional climate patterns, in particular a change apparent from the mid to late 20th century onwards and attributed largely to the increased levels of atmospheric carbon dioxide produced by the use of fossil fuels.

Some likely effects of climate change include that Earth will become warmer overall. Although in some places this may be a welcome change, there are many places where this could be a negative effect.

The overall warming will probably lead to more evaporation and precipitation overall, and some regions will become wetter while others become dryer. Some crops and plants may respond positively to increased CO2 levels ,growing vigorously and using water more efficiently. But higher temperatures and changing climate patterns may change the natural communities of plants, and where they grow

Global warming: a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants.

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