Study maps conversion of Brazilian Amazon wetlands across four decades

The story in brief

What you need to know

• The study defines converted wetlands as areas deforested and permanently changed to human-modified wetland. The category includes agriculture, pasture, mining and urban areas.12
• Human-modified wetland area increased by 28.9% over 2015–2024, according to the study. It also reports a median annual burned area of 9,493 km² for that decade, compared with 6,770 km² across the full study period.1
• The median share of human-modified wetland was highest on undesignated public land, at 13.80%, and in agrarian reform settlements, at 9.81%.12
• The study reports lower conversion in several protected and Indigenous land categories. These comparisons show different outcomes across tenure types, but do not by themselves explain why those patterns occurred.12
• Separate research by Imazon examines land laws that its authors say can incentivise public-land encroachment and deforestation. It provides governance context, but does not independently verify the wetland study’s measurements.31

Conservation context

Why this matters

The findings bring land tenure into discussions of wetland change in the Amazon, where wetlands also support riverine families and livelihoods. The study’s comparisons may help frame questions about land governance, while its observational design limits what can be concluded about causes.12

The developing story

What happens next

Further analysis is needed to test how much the tenure patterns remain after accounting for factors such as road access, soil suitability and market access. The reporting also leaves open how land designation, settlement support and enforcement could reduce conversion while protecting local livelihoods.12

Established evidence

What we know

• The analysis combines open datasets to track Brazilian Amazon freshwater wetlands from 1985 to 2024, across nine sub-basins and 13 land-tenure categories.1
• The study’s estimate is for deforestation and permanent conversion to human-modified wetland, rather than all forms of wetland change.1
• The Scientific Reports study notes that its correlational analysis does not control for factors including road access, soil suitability and market access.1

Open questions

What we don't know

• The extent to which access, market conditions and other local factors account for the differences between tenure categories remains unresolved.1
• Mongabay describes nearly a third of the destruction as occurring during 2015–2024, while the study reports a 28.9% increase in human-modified wetland area over that period. These are different formulations, and the underlying time-series data would need to be checked to reconcile them.12
• The available reporting does not establish which practical changes to land designation, settlement support or enforcement would reduce conversion while protecting livelihoods.12

Source coverage

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