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Nature 396, 619-620 (17 December 1998) | doi:10.1038/25224

C-quest in the Amazon Basin

I. Colin Prentice1 & Jon Lloyd1

Whether Amazonia is a carbon-dioxide source or sink has a significant effect on estimates of the global carbon budget. On an annual basis, El Niño, and its influence on precipitation in the region, seems to be a controlling factor.