The greenhouse effect is very important; if it didn’t occur at all, the temperature of the planet would be 40 degrees lower and the oceans would freeze. But an increase in the greenhouse effect may lead to global warming with disastrous consequences.
The higher average temperature produced by global warming could cause dramatic changes in the weather. Less rain might fall over large land masses. Central Africa, south Asia and some parts of the United States could risk severe drought and famine. More rain might fall in coastal areas and over the oceans; there might be more storms and hurricanes in the Pacific. A rise in the earth’s average temperature of only one or two degrees would probably melt the polar ice caps and raise sea levels. Sea levels throughout the world are already rising by about two millimeters a year. If the polar ice caps melt, sea levels could rise by more than a meter over a few decades.
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The Polar Ice Caps
Sea Levels
Rain
The Greenhouse Effect