Estimates vary, but much research points to around the middle of this century, roughly the 2040s to 2050, if warming and deforestation continue
Researchers estimate the danger zone lies near 20 to 25 percent forest loss combined with continued warming. Up to half of the Amazon's rainfall is recycled by its own trees, so beyond that threshold the remaining forest can no longer generate enough moisture to sustain itself, pushing it toward dieback. These figures are estimates rather than a fixed date, and the exact threshold remains uncertain.
