How do we save the world?

What ideas do you have to change things for the better?
The world is a mess, and jellies out there must have some suggestions on what we can do to cut pollution, improve energy use, maintain and/or revive our endangered species, or put an end to war.

(This question came to me while pondering the death of Patricia Neal, who saved the world with the words “Klaatu Barada Nicto”)