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I have read Dr. Lester Machta's article, “Acid Rain: Controllable?” (Eos, November 29, 1983, p. 953) and do not want it to go unchallenged.

The final paragraph of the article is hard to justify. I know Dr. Machta, and I think he knows many of my friends, and we are firmly of the opinion that we know enough to justify political action to reduce sulfur emissions now. We also know how to reduce them. Certainly we, as scientists, should work on the residual uncertainties, but in my opinion these are being used as an excuse for inaction politically and do not constitute a valid reason for no action.