Using energy efficient bulbs saves energy and money. So, its good for earth and good for you. If you can't afford to buy them, just refer to step one. You can make a sun jar (search) and have a cool lantern that charges in the sun. Solar this are good too, there's lots of instructables on using solar panels for energy. There's even one on charging battery's with solar panels! Make sure you use rechargeables. (so if oyu use that to recharge the batteries you use in your MintyBoost! charger...then you get energy free...if my calculations are correct.) Next step!