"I am no global warming denier. I believe that climate change is taking place and agree that we need to reduce carbon dioxide emissions. But not at any cost.
And the cost of the switch to diesel is terrifying.
Diesel exhaust is a complex mixture of thousands of gases and fine particles that contains more than 40 toxic air contaminants. These include cancer-causing substances such as benzene, arsenic and formaldehyde, as well as other seriously harmful pollutants.
The microscopic particles in diesel exhaust are less than one-fifth the thickness of a human hair, small enough to penetrate deep into the lungs and bloodstream, causing inflammation, asthma attacks, heart attacks and strokes, and worsening lung disease in the elderly and young. The World Health Organisation says long-term exposure to these particles — called PM2.5s because they are just two-and-a-half thousands of a millimetre across — alters the way children's brains grow and could make them less intelligent.
Californian research last year found a link between pollutants in diesel fumes and autism."