With the Johannesburg Earth Summit underway well done to Adam Trimmingham on his timely 50 ways to save the planet.

I'd like to suggest an important number 51: Copy Brighton and Hove City Council's example by buying your electricity from companies which source there supplies only from sustainable sources such as wind, hydro and solar sources.

Top of Friends Of The Earth's league table for electricity suppliers is Unite, tel: 0845 601 1410.

It is also possible to buy gas from an environmentally-friendly supplier. Amerada is the only British gas company where the CO2 emitted by using its gas is offset by a climate care scheme, tel: 0845 305 3000.

Just two phone calls and you can be on your way to dramatically cutting your impact on our world.

-Simon Burgess, Bute Street, Brighton