Some experts say than the year 2020 there will about 7 billon people....There will be more factories cars and intensive farming and that means more harful gases which will increase the greenhouse effect.These gases absorb the sun's heat and make the earth hotter . If things continue like this, some scientists predict than in 2030 the earth will be 2º to 4ºC.
Other areas will be drier and there will probably be more storms, floods and other natural disasters.
this report this caught of the newspaper "the country"(el pais)
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