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This is an opinion piece that quotes what seems to be reasonable sources.

I understood diesel to be a sound choice for environmental reasons.
Do we manufacture it differently or have I misunderstood?

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By Carl Pope

August 13, 2012

California can, and should, lead the world in ending the menace of soot and black carbon pollution from diesel engines.

We've all choked on black smoke billowing from diesel trucks and buses.
It's obviously polluting, but what's not obvious is much worse.
Diesel emissions are a major health hazard — cancer causing, in fact.
And they are a big part of the threat to our climate.

Yet cleaning them up is practical, easy and affordable — the rules just need to be enforced.

On June 12, the World Health Organization classified diesel particulate matter (soot) as a Group 1 "known carcinogen," adding it to an ugly list of chemicals that includes asbestos and cigarette smoke. The Environmental Protection Agency estimates that several thousand America ... "