12/30/2025
The Amazon rainforest, long regarded as one of Earth’s most powerful climate stabilizers, is entering a dangerous and unfamiliar phase. New research led by scientists at University of California, Berkeley shows the region is shifting toward a climate state researchers call “hypertropical” — a combination of extreme heat and prolonged drought unlike anything seen for tens of millions of years.
These hot droughts are more than just harsher dry seasons. They push the forest far beyond its natural limits, weakening trees and disrupting the Amazon’s crucial role as a global carbon sink. Scientists are already detecting noticeable spikes in atmospheric carbon dioxide during severe drought years, a worrying sign that the rainforest may be losing its ability to absorb and store carbon at scale.
The ecological damage is profound. During extreme events, tree mortality has surged by 55%, as plants face an impossible trade-off: shut down photosynthesis and starve, or keep water flowing and risk deadly air bubbles forming in their tissues — a failure similar to a stroke in humans. Fast-growing tree species are especially vulnerable, raising fears that the forest could permanently shift toward species that store far less carbon.
If greenhouse gas emissions remain unchecked, researchers warn that hypertropical conditions could dominate the Amazon for nearly half the year by 2100, with similar transformations likely in rainforests across Africa and Southeast Asia. This isn’t just a regional crisis — it’s a global warning that one of Earth’s most important climate buffers is approaching a tipping point.
Source:
Sanders, R. (2025). A new ‘hypertropical’ climate is emerging in the Amazon. Berkeley News, University of California, Berkeley.