Two seconds worth of googling gives me 15.6 million tons of CO2 from private flights, vs 3.35 billion tons from cars.
Minor nitpick: don’t compare millions to billions if you can afford it. Say something like “16 million VS 3350 million tons of CO2”. The meat of your point is 16 vs 3350, so highlight it!
Minor nitpick: don’t compare millions to billions if you can afford it. Say something like “16 million VS 3350 million tons of CO2”. The meat of your point is 16 vs 3350, so highlight it!