For 50 years, Philip Fearnside has calculated the costs of losing the Amazon

Philip Fearnside has spent 50 years in the Brazilian Amazon, publishing research that repeatedly contradicted official government estimates on deforestation, dam emissions, and land degradation, from his early fieldwork in Altamira's colonization settlements to decades of papers on hydroelectric methane output and soil loss.

At a 2021 public hearing in Manaus, his testimony against repaving the BR-319 highway was booed off the microphone by a crowd that included an ally of then-president Jair Bolsonaro, who questioned why an American should have any say in Brazilian land use. Years later, colleagues at INPA held a two-hour tribute recounting how his biomass and regrowth estimates, made before satellite verification existed, have since been confirmed by modern high-resolution mapping.

His work on shallow tropical reservoirs undercut the government's framing of hydropower as clean energy, showing that flooded vegetation produced significant methane emissions, findings that were unpopular even among Brazilian environmental groups at the time.

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