If you can't fit solar panels or other renewable energy source, or simply don't want to, a really good alternative is to switch to a renewable energy supplier.
Good Energy and Ecotricity both supply clean energy and will donate money to CFB for everyone who switches over to them. Good Energy provides 100% renewable energy from wind and solar PV and Ecotricity is aiming for 100% whilst investing in its own wind, solar, wave and biogas schemes. You can view both on our home page and click directly through to each website.
You may find this graphic helpful in making your decision; the section in yellow shows the % of renewable energy supplied by each company: