This Week's Letters

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Science  19 Jul 1996:
Vol. 273, Issue 5273, pp. 293-297
DOI: 10.1126/science.273.5273.293

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Ah, wilderness!

Are changes in the chemistry of stream water and forest soil a result of “the natural processes of soil acidification” or of the “anthropogenic emissions” in acid rain? (At right, rainwater sampling at the Hubbard Brook Experimental Forest, New Hampshire.) Elsewhere, the herbivorous appetite of certain soft corals is measured. How robust is the evidence that human activity is accelerating the rate of species extinctions worldwide? And the difference between ion transport in membrane channels and the diffusion of molecules through zeolites is explicated.