多种树:plant more trees
节约用水:save on water
保护环境：protect the environment
减少污染：reduce pollution
垃圾：rubbish
白色污染：white pollution
二氧化碳：carbon dioxide
臭氧层：ozonosphere
臭氧层空洞：ozone hole
南极臭氧层空洞：Antarctic ozone hole
北方臭氧层空洞：northern hole
北极臭氧层空洞：Arctic ozone hole
修复臭氧层空洞：repair the ozone hole
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