Researchers Compare Three Strategies to Save the Amazon, One Clearly Stands Out

Do we really need to replant millions of trees to save the Amazon? A sweeping study challenges this assumption. After comparing three conservation strategies in Brazil, researchers reveal that a less dramatic priority could deliver far greater ecological benefits on the ground.

Three strategies put to the test in an Amazon where every hectare now counts

To differentiate the solutions, the researchers studied more than three million hectares across two regions of the Brazilian Amazon. Published in the journal Science, their study combines field observations, satellite data, and modeling. It covers notably 38 watersheds and 499 rural properties, enabling the observation of landscapes that are very different.

Three scenarios were then confronted: preventing the complete disappearance of forests, avoiding their degradation by fires and logging, or restoring agricultural lands. The team evaluated their effects on carbon as well as on 160 bird species and 426 tree species, not forgetting their economic cost.

The most striking finding concerns forests that still appear intact

First lesson: saving a tree that is already standing can be far more effective than having to grow a new one. Interventions preventing forest disturbances, including fires and certain forms of exploitation, yielded the largest biodiversity benefits among the strategies studied.

This result reveals a rather subtle problem. A forest can remain visible from the sky while being deeply weakened. Fire, logging, and edge effects alter its functioning without necessarily causing its immediate disappearance. Protecting the Amazon, then, is not only about keeping bulldozers from advancing.

Tree replanting remains essential, but not necessarily where you’d expect

Restoration carries a particularly appealing image: degraded land, young trees, then the gradual return of a forest. In practice, the equation is more challenging. Used alone at the studied scale, this strategy proved less effective and more costly than measures that directly prevent losses.

That said, restoration is by no means condemned. It becomes particularly valuable in landscapes where a large portion of the original forest has already disappeared. It all depends on the starting point. Where a mature forest persists, the priority is to conserve it. Where it has vanished, rebuilding the ecosystems makes perfect sense.

The best answer finally emerges when strategies stop opposing each other

Perhaps the study’s most interesting revelation. At the analyzed scale, simultaneous net gains for biodiversity and carbon required combining deforestation prevention with protection against disturbances. Adding restoration then allowed even greater gains.

In other words, the question is not simply whether to protect or replant. The researchers propose instead a landscape-adapted hierarchy of priorities: preserve what remains standing, prevent its degradation, then restore intelligently the areas where the forest has already been lost.

This logic becomes even more important with climate change. Restored young forests can themselves remain vulnerable to fires, the team notes. Restoring without securing the existing forests would thus be like mending part of the roof while another part continues to burn. An image that substantially changes how we think about the Amazon’s future.