Now,itmaybedifficulttopredictthefuture,butmanypeoplebe...
問題詳情： Now,itmaybedifficulttopredictthefuture,butmanypeoplebelievethatwewillliveonMarsbytheyear2100.Ourownplanet,Earth,isbecomingmoreandmorecrowdedandpolluted.Well,whatproblemswillweneedtosolvebefo...