“Using a canopy crane to access the treetops, we installed custom-made leaf-heater boxes to warm leaves from four mature tree species by 4°C – a temperature rise predicted for tropical systems by 2100.
Our study found warming reduced photosynthesis across all species.
Photosynthetic rates dropped by an average of 35% in warmed leaves compared to non-warmed controls.”
https://theconversation.com/study-shows-hot-leaves-cant-catch-carbon-from-the-air-its-bad-news-for-rainforests-and-earth-246975
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