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Percent Photosynthesis (Net CO2 Exchange Rate) Increases for 300, 600 and 900 ppm
Increases in the Air's CO2 Concentration:

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Salvia Nemorosa [Woodland Sage]

Journal References

Experimental Conditions
300 ppm

600 ppm

900 ppm
Nadas et al. (2008)
Photosynthesis of plants growing in monoliths extracted from a grassland and transplanted into open-top chambers, where they were exposed to differential atmospheric CO2 for 15 months
85%
 
 
Szente et al. (1998)
Plants grown for 231 days in open-top chambers
470%