Driving Concern is a term used to describe the environmental impact of cars and other vehicles. It refers to the amount of pollution created by burning gasoline, as well as the amount of energy consumed by cars and other vehicles. The term is often used in discussions about reducing emissions and improving fuel efficiency. The solution to this crossword is GAS, which is an acronym for 'Gasoline And Synthetic fuels'. Gasoline is a fossil fuel that is burned to power cars and other vehicles, and synthetic fuels are alternative fuels that can be used instead of gasoline.