As we know ,the earth is gradually becoming warmer and warmer .It's global warming that may be thought highly of by someone ,who always says that it could help the cron grow up such as in a greenhouse...
As time goes by, man is making the earth sick. People cut down too many trees and leave rubbish everywhere. Factories let out their waste without doing anying to it . This has cause some serious probl...
The population of the earth is increasing very fast. Humans must make the earth support the increasing population.This has made it necessary for agriculture and industry to develop rapidly. Such a rap...
