If you lose interest in a mailing list, you'll need to remove your address from the mailing list's database, or
a. sign out.
b. delete.
c. defriend.
d. unsubscribe.

 The best answer is unsubscribe from the mailing list. When one unsubscribes, it removes their email address from the mailing list database and you no longer receive their newsletters and promotions. 

Maybe littering, cutting down trees and pollution