Satellite observations show widespread increasing trends of leaf area, known as the Earth greening. Increasing CO2 promotes photosynthesis causing plant to grow faster and use water more efficiently. Earth greening causes a reduction in land surface temperatures in 93% of the vegetated area. The abstract says “The increase in [leaf area index] LAI produces a decrease in aerodynamic resistance, thereby favoring increased turbulent heat transfer between the land and the atmosphere.” Aerodynamic resistance mostly related to surface roughness. The study finds that the area of LAI-induced cooling (30%) is six times of that of LAI-induced warming (5%). Aerodynamic resistance plays a dominant role in regulating the biophysical impacts of Earth greening on land surface temperatures.

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https://advances.sciencemag.org/content/6/47/eabb1981

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