Amazon Tipping Point: Rainforest Could Turn to Grassland in Decades

New research published in Nature warns that the Amazon rainforest could transition into a degraded, grassland-like ecosystem within a few decades if deforestation and global warming continue unabated. This study provides critical insight into the potential tipping point, beyond which irreversible ecosystem transformation begins.

The analysis highlights a dangerous feedback loop: deforestation exacerbates global warming effects by reducing rainfall, which in turn lowers the temperature threshold for ecosystem changes. Without deforestation, the Amazon could withstand up to 3.7°C of warming, but with at least 17% already lost and 1.4°C warming already occurred, the risk is significantly heightened.

Researchers found that a tipping point could be reached relatively quickly. If 22% or more of the Amazon rainforest is deforested, a significant portion of the ecosystem could become vulnerable to collapse at temperatures exceeding 1.5°C of warming. If current rates of deforestation and warming persist, this danger zone may be reached in approximately 25 years.

However, there is a possibility that the Amazon could avert this midcentury tipping point if Brazil successfully continues to slow deforestation. Global efforts to halt forest loss by 2030 are significantly behind schedule, and the world is expected to overshoot the Paris Agreement's target of limiting warming to 1.5°C. Avoiding catastrophic consequences for the Amazon and the planet necessitates halting deforestation immediately and undertaking substantial forest restoration.

While the study focuses on completely deforested areas, partially degraded regions and an increase in wildfires could also accelerate the tipping point. Conversely, regrowing forest areas might eventually aid in restoring the Amazon's natural moisture-recycling capabilities, offering a glimmer of hope for the vital ecosystem.