Earth Greening Under Water Stress
Worldwide patterns of increased plant water stress reveal water limits to vegetation greening.
A recent study published in AGU Advances reveals that while Earth has shown signs of greening due to global warming, this vegetation increase is being obscured by growing plant water stress. The research, conducted by Chang et al. [2026], examines the relationship between leaf area index and water use efficiency in response to increasing CO2 levels.
The study identifies water controls on vegetation greening by analyzing structural and physiological impacts. The findings show worldwide patterns of increased plant water stress and ecological drought, attributed to soil moisture, atmospheric aridity, and regional climate changes. The study attributes these factors to changes in plant water stress using a Random Forest model, which incorporates meteorological factors, soil and atmospheric aridity, and atmospheric CO2 levels.
This research underscores the emergence of water limits on Earth greening, revealing how local interdependencies between the carbon and water cycles impact vegetation health.
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