The effect of darkness on our trees and plants Now suppose the sun sets so there's no longer light shining on our plants. Which of the above processes is taking place in the plants now? What should happen to the carbon dioxide concentration in our ecosystem now?
Lets take a few more readings from the analyzer to find out. The CO2 concentration went up because plant respiration released carbon dioxide into the atmosphere.
	The CO2 concentration went up from 345.3 to 489.7 ppm because plant respiration released carbon dioxide into the atmosphere.

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