W ar now living in a common hom. That is th arth. Sh provids us with nough food, nough watr and nough living room. So w must do vrything to protct hr. Thr ar lots of big or small, rd or grn, bautiful gardns around us .But thr ar still som othr lands bar of grasss or trs on th arth. Som popl may ask why not ld all lands covrd with trs, flowrs and grasss? Why not prvnt th lands from bing dsrt? Why not prvnt th air from bing pollutd? And why not prvnt th arth from bing poisond? Ys! Our nvironmnt is bing pollutd fastr than natur and mans fforts can prvnt. Tim is bring us mor popl, and mor popl will bring us mor industry. So many trs will b cut down, and mor larg citis will b st up. Lots of wast matrial, in rturn, is producd and harms th nvironmnt. So som xprts dclar that th balanc of natur is bing dstroyd. Th survival of man is in dangr. W fl rally sad about it. What can w do to solv this problm? W must forbid cutting down trs and forbid killing animals and pouring wast watr into rivrs and so on. Wll nvr dstroy th balanc of natur. Lts gt along wll with all animals. Lt th trs, flowrs and grasss com back to our hom. Bcaus w hav only on hom --- th arth.