Green Plumbing

Answer: B - Agriculture trails the other three responses, as well as commercial/residential, as a source of greenhouse gases in the US (as of 2014). It accounts for about 9% of US greenhouse gas emissions. Electricity production (primarily burning of coal and natural gas) is first, at 30%, followed by transportation (mostly gas and diesel), at 26%, and industry (fossil fuel-burning, plus raw material conversions) at 21%.