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18.06.2010 20:47

Weather and climate





Climate is the weather a certain place has over a long period of time. Climate has

a very important influence on plants, animals and humans and is different in

different parts of the world. Some scientists think that the world is becomming

hotter. If you compare Moscow winter and summer temperatures at the beginning of

our century and at its end you will see that climate has really changed. Winters

have become warmer. Sometimes there is little snow in January, and there were

winters when it rained on the New Years Eve. Many people say that it is so because

of the greenhouse effect. During the last 100 years people have produced a lot of

carbon dioxide. This gas in the atmosphere works like glass in a greenhouse. It

lets heat get in, but it doesnt let much heat get out. So the atmosphere becomes

warmer. Where does the carbon dioxide come from? People and animals breathe in

oxygen, and breathe out carbon dioxide. We produce carbon dioxide when we burn

things. Trees take this gas from the air, and produce oxygen. But in the last few

years, people have cut down and burn big areas of rainforest. This means there are

fewer trees, and, of course, more carbon dioxide As we see the climate in

different parts of the world changes a little from year to year. These changes can

be dangerous for our planet, which needs protection. Earth is millions of years

old, much older than the humans. We know many of its secrets. Yet there is still

much to learn.
 

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