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By Science News
The serious harm caused by microscopic dust really made me wonder about diesel. You noted that the submicron-scale spheres in the lungs of a nonsmoking resident of Mexico City appeared to be diesel-exhaust particles. While Europeans worry about what will happen in 100 years from global warming, could they be killing themselves now with their huge jump in diesel use in recent years?
Ernest Lieberman
New York, N.Y.
Meredith Warshaw
Newton, Mass.