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Global Climate Changes
The word weather means “the atmospheric at a specific place and time. ” The
weather can vary from day to day. In contrast to weather, climate is “the
general or average atmospheric conditions of a region.” In different areas of
the globe, the climate generally stays the same from year to year. For
example, the climate in the desert is usually very dry. It may be cold in
winter and hot in summer, but there is very little rain or humidity. In
contrast, in tropical rain forests, there is very high humidity. In most other
areas of the world, the weather is cool or cold and wet or dry in the winter
season. It is warm or hot and dry or humid in the summer months.
According to some meteorologists (weather researchers), the
earth’s climate is changing slowly. In most places on the earth, the
weather varies from season to season or even from day to day. In
contrast, the typical climate is similar every year. Even so, there
may be global climate changes from one long time period to another.
What are these changes? Some scientists believe the weather is
becoming more extreme. There are longer periods of very cold and
very hot temperatures. There are more and more powerful
hurricanes and tornadoes (storms with strong, fast winds) and
blizzards (heavy snowstorms). Floods (large amounts of water on dry
land) and long droughts (times without enough rain) are causing
greater and greater physical damage to the human communities on
Earth. These extreme forces of nature will get even worse in the
future, say some people. And every change in climate in one part of
the globe will bring more extreme changes in other areas.
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