Support producers of renewable energy. Help spur the renewable energy market by participating in it. In the UK you can get 100% renewable electricity by switching to a company such as Ecotricity or Good Energy Ltd. Alternatively, you can buy wind certificates, green tags and stock in renewable energy companies. Many of these companies are new and small, and the stock is low in price. These companies may offer opportunities for great returns if they prove profitable; just be sure to do your homework first, as you would when investing in anything.