Well, this would definitely be phased in slowly. While phasing in, the technological side would be getting better and better as companies providing scrubbing would be building capability and competing to do it cheaply.

Also take in mind the problem might be solved in a different way, for example people switching to high speed trains for shorter rides, business meetings conducted remotely or people choosing more local travel destinations or alternative ways to spend free time.

The important part is to factor in all costs of products and services into their price, keeping environment clean included.