Couple of bucks. A gallon of gas emits 20-lbs of CO2, or ~1% of a tonne. Cost to remove CO2 from the atmosphere is roughly a few hundred $/tonne to about 70$/t

Couple of bucks. A gallon of gas emits 20-lbs of CO2, or ~1% of a tonne. Cost to remove CO2 from the atmosphere is roughly a few hundred $/tonne to about 70$/tonne depending on who's doing the estimating.