Sometimes little things can have big impacts. The BioLite HomeStove has the ability to make a lot of lives better while reducing tree loss in many parts of the world. The innovative cooking device is a highly efficient "jet" or "rocket" stove that burns small amounts of wood while generating a lot of heat. There are many similar jet stoves, and because they are so good at creating lots of heat quickly, in many impoverished areas, the stoves can dramatically reduce the amount of wood needed to cook food, and make it possible to sterilize water much more easily. The stoves also reduce the amount of work needed to collect wood, which, if you are cooking for a family over an open fire, can be very significant.
But the real innovation of this device is the integrated thermocouple that powers a small fan (to make the stove more efficient) and powers a USB port that can charge small portable devices like LED flashlights and cell phones. It is an amazing innovation that has the potential make millions of lives better.