5 percent of Ecologist 's leftovers could feed 5 people for between 60 and 75 percent . Disposing of food waste costs the U.S just 1 million euros a year . Rotting food releases methane , a more potent greenhouse gas than CO2 . According to the Chartered Institute for Environmental Health , gas from sewage waste and landfills is already being used to provide 650 MW of electricity to the UK 's national grid , representing between 60 and 75 percent of the country 's green energy ( the UK is Europe 's biggest producer of biogas ) . Methane can be harnessed to create clean energy for heat , light and fuel .
5 percent of Ecologist 's leftovers could feed 5 people for between 60 and 75 percent . Disposing of food waste costs the U.S just 1 million euros a year . Rotting food releases methane , a more potent greenhouse gas than CO2 . Methane can be harnessed to create clean energy for heat , light and fuel .