Kerosene lamps produce 244 million tonnes of carbon dioxide each year, causes a number of health problems, and a number of fires start because of kerosene lamps. LED powered Gravity Light which uses no battery to light up, albeit at a low-level, a room for half an hour. At US$5, it is suitably priced to rid the poor without safe access to electricity of kerosene’s hazards. Read more here, here and here.