"Save a drop of water, save a life for posterity"

今天节约一滴水，留给后人一滴血

"The earth is not a treasure, energy needs our care"

地球不是天然宝库，能源更需你我呵护

"Flowers and grass share fragrance, please take a detour"

小花小草传芳香，请你把路绕一绕

"Our duty to save the earth is our responsibility"

保护地球是我们与生俱来的责任

"A green campus starts with you and me"

校园美如画，受益你我他

这些标语既符合环保主题，又具备传播性和号召力，适合用于环保宣传、校园活动或社区倡议。