I hope we will see cleaner air in cities! But the time it takes to replace a country’s vehicle fleet is sometimes measured in decades, and no-one is even starti

I hope we will see cleaner air in cities! But the time it takes to replace a country’s vehicle fleet is sometimes measured in decades, and no-one is even starting on a project of massively reducing fleet emissions. I think / hope you are right in the long term, but I think I am right in the short-medium term :)