to AvoiD thE mistAkEs oF our ForEFAthErs, thE Author suggEsts thAt______.
A．wE plAnt morE trEEs
B．nAturAl sCiEnCEs BE tAught to EvEryBoDy
C．EnvironmEntAl EDuCAtion BE DirECtED towArD EvEryonE
D．wE rEturn to nAturE