Recent increases in terrestrial carbon uptake are often assumed to reflect thermal acclimation. Using global eddy-covariance and satellite observations, Xu et al. show that maximum ecosystem photosynthesis increased without a global rise in optimum temperature. Instead, stomatal regulation and canopy development played larger roles, especially under dryness, suggesting that future land carbon projections must go beyond thermal acclimation alone.

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Global biodiversity hotspots, including Mediterranean-type ecosystems worldwide, are highly threatened by global change that alters biodiversity, ecosystem functions, and services. Some restoration a....