Rising threat of transport emissions | Letters

Harold Forbes says the principle of polluter pays is rarely implemented; Jeremy Tomkinson calls for clear policy on lowering petrol emissions; Chris Tidmarsh laments the sparsity of electric-car charging points in Southwark and LambethYour article on carbon dioxide emissions from new vehicles (Fall in CO2 output from new cars goes into reverse, 27 February) makes no mention of the eight-year freeze on fuel duty, which has contributed to UK fuel prices being 4% below their 2000 levels in real ter