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Escrito por Nunes às 21h58
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EEFM Profa. Tecla Ferreira - 2a. Avaliação Parcial de Inglês - 3o. Ano - 2007
Text: Global warming
Global warming is the increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation.
An increase in global temperatures can cause other changes, including sea level rise, and changes in the amount and pattern of precipitation resulting in floods and drought. It can also change the frequency and intensity of extreme weather events, though it is difficult to connect specific events to global warming. Other effects may include changes in agricultural yields, species extinctions and increases in the ranges of disease vectors.
Scientists can not predict the exact degree of climate change expected in the future, and how changes will vary from region to region around the globe.
But aren’t temperature changes natural?
Occasionally, other factors briefly influence global temperatures. Volcanic eruptions, for example, emit particles that temporarily cool the Earth's surface. But these have no lasting effect beyond a few years. Other cycles, such as El Niño, also work on fairly short and predictable cycles.
Now, humans have increased the amount of carbon dioxide in the atmosphere by more than a third since the industrial revolution. Changes this large have historically taken thousands of years, but are now happening over the course of decades.
Most national governments have signed and ratified the Kyoto Protocol aimed at combating greenhouse gas emissions.
Adapted from Wikipedia, the free encyclopedia in
http://en.wikipedia.org/wiki/Global_warminghttp://en.wikipedia.org/wiki/Global_warming and from National Geographic (adapted)
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Escrito por Nunes às 21h56
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