范文：篇1

deardavid,

i’mgladthatyou’venoticedoureffortsdirectedtowardsenvironmentalprotection.thankyouforyourconcern.

astoomuchuseofplasticbagshascausedseriouswhitepollution,ourgovernmentencouragesustouseenvironmental–friendlyshoppingbags.thesebagsaremadeofavarietyofmaterialsthatcanbeeasilytreatedwhentheybecomerubbish.besides，theycanbereused.moreandmorepeoplehaverealizedtheadvantagesofsuchbagsandstartedusingthem.

ibelievethatthewideuseoftheseshoppingbagscangreatlyimproveourenvironment.thisisoneofthemanystepswearetomakeourcountryanevencleanerplace.