ERRATUM. In the original published version of the Literature Cited section, the citations to Nepstad et al. 1999a and 1999b were erroneous:

Nepstad, D. C., P. Lefebvre, and E. A. Davidson. 1999a. Positive feedbacks in the fire dynamic of closed canopy tropical forests. Science 284:1832-1835.

Nepstad, D. C., A. Verissimo, A. Alencar, C. Nobre, E. Lima, P. Lefebvre, P. Schlesinger, C. Potter, P. Moutinho, E. Mendoza, M. Cochrane, and V. Brooks. 1999b. Large-scale impoverishment of Amazonian forests by logging and fire. Nature 98:505-508.

The correct citation is for Nepstad et al. 1999 as follows:

Nepstad, D. C., A. Verissimo, A. Alencar, C. Nobre, E. Lima, P. Lefebvre, P. Schlesinger, C. Potter, P. Moutinho, E. Mendoza, M. Cochrane, and V. Brooks. 1999b. Large-scale impoverishment of Amazonian forests by logging and fire. Nature 398:505-508.

November 2, 2000