Car filth kills
YouGov, whom I rather like, had a blog posting Londoners support a monthly car-free day Sadly, this comment did not get through their moderation.
(1) Cars kill the planet:
4 tonnes CO2 per year and 5 tonnes to make one. The UK Climate bill aims to get us to average 2 tonnes a year.
(2) Car filth kills:
Air pollution to blame for 60,000 early deaths per year, Government to be warned
(3) We need Green Ghettos with hardly any cars to save the world and avoid the filth. See The parable of the smoking carriages