We all know that big-engined gas-guzzlers are wrecking the planet and need to be driven off the road. Instead, we should all be using clean-green public transport for local journeys.   

The term ‘clean’ has become synonymous with super-frugal, low-CO2, cars but it is deeply-flawed terminology. CO2 may well be one of a number of ‘greenhouse’ gases, but in terms of an immediate threat to human health, it is the byproducts of diesel combustion that are the real problem.   

I cannot understand why there wasn’t a uproar when, a few months ago, the World Health Organisation declared that diesel engine exhaust fumes can cause cancer in humans. Incredibly, the WHO placed diesel engine exhausts gases in the same category as asbestos, arsenic and mustard gas.