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By KAILA DUNN, age 12

Your waste comes to use! Many countries are starting an environmentally friendly way to create fuel to power our transportation with human waste. In Bristol, England, GENeco Bio-Bus powers buses using human waste. It all starts when people flush the toilet. Scientists use bacteria to break down the sludge, releasing methane that can be burned as a renewable source of energy. The energy can be used to power buses to travel up to 2.5 million miles a year. Inland Empire Utilities Agency, a wastewater treatment plant company in California, fuels its plant in a similar way. Biofuel cells use bacteria to break down human waste for energy. When heated, the cells reacts with oxygen, producing water, carbon dioxide and electricity.