I am 2 years retired from the Met Office , so I should know what is what when it comes to Climate Change, but I won't get onto the subject here! Climate change is caused by human activity, but what I want to say is that our diesels are not contributing to climate change as much as our petrol cousins. Going back a few years diesels were encouraged by Government as they contributed less with their lower CO2 emissions. Petrol cars contribute more CO2!! However local Government are on the band wagon of diesels being more of a health hazard with their higher NOX emissions, that are dangerous to all us humans,. The Climate change argument is not just diesels, but all forms of fossil fuel burning vehicles!!