| CO2 | Atmospheric carbon dioxide |
| eCO2 | Elevated carbon dioxide |
| RuBisCO | The enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase |
| FACE | Free-air CO2 enrichment |
| ppm | Parts per million |
| CEE | Collaboration for Environmental Evidence guidelines |
| PECO | Population, Exposure, Comparator and Outcome eligibility criteria |
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