环保英语口号文案可以包含以下内容：

呼吁保护水资源

"Water - Two Billion People are Dying for It!"

"Save the Earth, Save the Future."

"For Life on Earth - Save Our Seas."

"Protect the Earth's environment -- the homeland of all mankind."

强调环保意识

"Raise the environmental awareness of the entire nation."

"Awaken the whole nation to the importance of environmental protection."

"The attention to environment issue has become an irreversible historical trend."

倡导环保行动

"Take practical measures to improve the environment."

"Plant a tree, green for a day."

"Protect the environment and benefit the people."

"Love green mountains and waters, love blue sky and white clouds."

提倡节约资源

"Conserve water resources, duty of every individual."

"Save water, it's everyone's responsibility."

"Turn waste into treasure."

呼吁保护动植物

"Please protect every tree and bush."

"Don't tread on the green grass, don't pick the flowers."

"Love the green grass, leave it unharmed."

强调环保与发展的平衡

"Protect the environment is to protect productivity."

"Don't develop the economy at the expense of the environment."

鼓励个人参与

"The earth has no health without human health."

"I am a member of environmental protection."

"Take a proactive role in waste reduction campaign."

这些口号旨在提醒人们关注环境问题，鼓励大家从自身做起，采取实际行动来保护地球。你可以根据具体场合和需求选择合适的口号，以增强环保宣传的效果。