slogans on environment protection?

Question

Slogans on Environment protection are required for project work to be submitted by my 6 years old son

Answer 1

Random thoughts off the top of my head . . .
"Don't be mean, keep it green"
"Every day is mother's day for Planet Earth"
"Recycle. Replinish the Earth."

My favorite slogan that was actually used during a water shortage in CA during the late '70s was:
"If it's yellow, let it mellow. If it's brown, flush it down."

Good luck.

Answer 2

if black is beauty old is gold then clean is green