Answered: For World Environment Day on June 5, what is the top source of greenhouse gas emissions in the US?

According to the Environmental Protection Agency, in 2020 transportation accounted for 27% of greenhouse gas emissions, narrowly edging out production of electricity (25%) as the single greatest source of gases that trap heat and make the planet warmer. Greenhouse gas emissions from transportation primarily come from burning fossil fuel for cars, trucks, ships, trains, and planes. Over 90% of the fuel used for transportation is petroleum-based, primarily gasoline and diesel.