Images from the 1970s--of rattling engines and tailpipes spewing black soot--are hard to shake.
FORBES: The Other Green Engine: Diesel?
Greenhouse gases apart, experts say, emissions from India's power plants, factories and transportation have led to the accumulation of aerosols and black soot in the skies of the Indian sub-continent.
BBC: South Asian bloc active at climate meeting
It developed black wings, so that it was invisible when it settled on soot-covered tree trunks.
ECONOMIST: Pollution and evolution
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