At dawn, nine-year-old Anzelma walks for miles in search of firewood. Many in her village have died from drinking dirty water, and firewood is a valuable commodity, used to boil water to make it safe. One program is attempting to change this by providing 900,000 water filters to the people of Kenya's Western Province, for free. The innovative project is financed with carbon credits earned through the reduction in use of firewood. If successful, it will cut carbon dioxide emissions by 2 million tons per year for a decade or more. It just requires changing the habits of 4.5 million people first.