We thank D. J. Stewart for help in producing Figure 3,
B. S. Soares-Filho for sharing protected area data, and M.
Aguirre (International Rivers) for sharing data on dams.
Funding support to L.C. was provided by the Gordon
& Betty Moore Foundation, and to L.H. was provided
by the NASA Terrestrial Ecology Program. John Melack,
David Strayer, and two anonymous reviewers provided
valuable feedback.