Eachyear,500millionpeoplefrom164countriescelebrateWorld...
问题详情：Eachyear,500millionpeoplefrom164countriescelebrateWorldEnvironmentDayon5June.Itmayseemlikethereisnotmuchthatanindividualcandotosavetheworld,butthereis.Oneofthefirststepsistounderstandtheproble...