They should ban diesel cars and cabs first and restrict trucks off the roads during rush hours. I can barely breathe when I cycle in Central London.
Two parts of carbon pollution are difficult. 1. It's a diffuse source pollution problem. You can look a coal fire plant, and yes these are great contributers but so are cows and just general agriculture. Emissions come from everywhere!
2. dealing with gaseous carbon pollution is also tricky because its up high and CO2 is reasonably stable. If we are going to try and filter air from the atmosphere we are probably going to have to either look at biological sequestration solutions ie. algae etc or energy expensive options to break down the carbon.
And conservation of mass being what it is we are going to end up with a lot of waste to store.
And that article talks about 8 million pounds....oh well.
Given that, putting even more load on public transport by restricting vehicle traffic would be politically very difficult. Crossrail will help relieve the pressure along its route (10% capacity bump on rail!) but given the growth in the cities population and the possibility that the population figures are wrong anyway (the UK has not done a census for a long time), planners are anticipating that nearly all the added capacity will be used within just a few years. Hence them starting to plan Crossrail 2 before Crossrail 1 is actually finished.
http://www.telegraph.co.uk/news/2017/02/17/drivers-older-die...