2624165 eCO2 elevated CO2 214 2624184 eCO2 elevated atmospheric CO2 37 2624183 eCO2 elevated atmospheric CO2 concentration 34 2624172 eCO2 elevated CO2 concentration 10 2624171 eCO2 elevated CO2 concentrations 10 2624181 eCO2 elevated levels of CO2 3 2624185 eCO2 elevated air CO2 2 2624168 eCO2 elevated CO2 levels 2 2624180 eCO2 elevated levels of atmospheric CO2 2 2624169 eCO2 CO2-enriched atmosphere 1 2624177 eCO2 ecosystem carbon cycling to rising CO2 concentration 1 2624176 eCO2 effects of CO2 enrichment 1 2624175 eCO2 effects on plants under the current and future CO2 1 2624174 eCO2 elevated 700ppm CO2 1 2624173 eCO2 elevated CO2 at 600 ppm 1 2624170 eCO2 elevated CO2 conditions 1 2624182 eCO2 elevated concentrations of atmospheric CO2 1 2624179 eCO2 elevating atmosphere CO2 1 2624178 eCO2 Elevating CO2 1 2624186 eCO2 enriched CO2 1 2624187 eCO2 expected increase in the future CO2 levels 1