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Science 6 December 1996:
Vol. 274. no. 5293, pp. 1610 - 0
DOI: 10.1126/science.274.5293.1610b
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Research News

Jocelyn Kaiser

A new, long-term study of grasslands (see p. 1720) suggests that nitrogen deposition from the burning of fossil fuels and the use of agricultural chemicals may not be helping to mitigate possible global warming after all. Nitrogen "fertilizes" ecosystems, making plants grow bigger, sequestering more carbon aboveground. But nitrogen also favors the growth of fast-growing, invasive species, which aren't very good at fixing carbon in soils.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)