This idea is in progress, you can follow it here!
Be a Plant-Eater for one month. No meat, no dairy products. Google/YouTube on 'PlantenEter' and you will get inspiration. You will do good for your own health as well as the health of the planet and mankind. Chance that you will continue after one month is rather big. Making it a good investment into a new and better lifestyle. An idea from Hans van Dam