About helping, one concern is to know if your actions are effective. One website that I found may help people to know about it:
http://www.lacalculettecollaborative.fr/.
(Sorry for English-speaking people, this website is only in French for the moment)
This website helps you calculating your CO2 footprint, and gives you suggestions to help reducing your footprint by using the share economy. It can be useful, I think.