有关于 “中学生上网的好与坏” 英语作文80词左右

Some experts predict that in the year 2020 there will be about 7 billion people on this planet. If they are right, then there will be more factories, cars and intensive farming. And that means more harmful 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 that in 2030 the earth will be 2�0�2 to 4�0�2C hotter. In general, the weather will probably be cloudier and wetter and some areas will be more fertile and better for farming. But changes will not be positive: and there will probably be more storms, floods and other natural disasters. These changes will affect everyone - everywhere