Without water, forests lose their ability to absorb CO₂
During drought, trees can halt photosynthesis, the water-intensive process through which they absorb carbon dioxide. The supplied report says each CO₂ molecule absorbed by a leaf is associated with the release of about 400 water molecules, and that entire forests may emit more CO₂ than they capture during dry periods.
Trees may halt photosynthesis during drought to survive, according to the supplied report. Photosynthesis requires substantial water, and each molecule of carbon dioxide absorbed by a tree leaf is associated with the release of an average of about 400 water molecules.
The report says that, under these conditions, entire forests may emit more carbon dioxide than they capture.
THE QUESTIONS THIS EVENT LEAVES BEHIND
How long must drought conditions persist before a forest shifts from absorbing carbon dioxide to emitting more than it captures?
Which forest types are most vulnerable to this shift in carbon exchange?
How might repeated droughts affect the ability of forests to recover their carbon uptake?
What conditions determine whether a drought-stressed forest resumes photosynthesis?
How should carbon estimates account for forests that alternate between absorbing and emitting carbon dioxide?
YOUR QUESTION
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GLOBAL CURIOSITY MAP · AUGUST 2026