Going back to basics like switching off lights in unoccupied rooms can go a long way in the reduction of fossil fuel effects on the environment, especially if 49m people do it consistently. This is a South African government initiative to educate both old and the many new users of electricity.
Find out more details on this campaign in this document: http://www.eskom.co.za/content/20110318QandA49m.pdf
Do you think it was/is effective? See what researchers found: http://www.energyforecastonline.co.za/articles/a-positive-response-to-49m-campaign