The average in the US is about 16. I agree that the correct solution is to just whack a carbon tax on flights. It's ideal if people voluntarily reduce - I've

The average in the US is about 16. I agree that the correct solution is to just whack a carbon tax on flights. It's ideal if people voluntarily reduce - I've committed myself to not flying except in case of family emergency - but ultimately that's not going to solve the problem because it's a tragedy of the commons.