What have we learned from 15 years of free-air CO2 enrichment (FACE)? A meta-analytic review of the responses of photosynthesis, canopy properties and plant production to rising CO2.

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Endemic species and ecosystem sensitivity to climate change in Namibia (2006, background): “This is a vital uncertainty, as a recent review suggests that tree PFTs show the most significant positive response to elevated CO2 of all PFTs investigated (Ainsworth & Long, 2005).”
Long‐term increases in intrinsic water‐use efficiency do not lead to increased stem growth in a tropical monsoon forest in western Thailand (2011, background): “Free-air CO2 enrichment (FACE) field experiments have played a key role in addressing uncertainties in forest responses to elevated [CO2] (reviewed in Ainsworth & Long, 2005).”