Climate change is associated with global warming and is a long-term change caused by natural factors and, as is now accepted, human activities due to greenhouse gas emissions.
The average temperature of the earth’s surface has risen by 0.6°C since the late 1800s. It is expected to increase by another 1.4 to 5.8°C by the year 2100, and the sea level may rise from 9 to 88 cm during the same period.
It is generally agreed that more precipitation can be expected from 30° North and 30° South because of increased evapotranspiration. In contrast, many tropical and subtropical regions are expected to receive lower and more erratic precipitation in the future.
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