Question

I want ideas to make a poster on "save environment". fast

Answer 1

following points help in making this posters
1) make animals because it is very important in environment 
2) make trees and give its importance in slogans
3) write slogans effectively say save environment and its important
4) why we should save environment 
5) you can remember to show that impact of it on life in human being

Answer 2

you can make a Earth and many trees around it