Nicoleta01
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Better, but that doesn't mean more, as Phoenicks tried to say. When the factors are right, then yes, but they could grow anyways if the conditions were decent to start with. They could grow faster, and better, but in increased numbers? You can't simply put more and more plants into a confined area and think it's all good. Especially when you use area for farming and cutting down the natural vegetation.
I did see a program on TV that mentioned that they had measured CO2-emissions versus absorption from trees, was it in France? I do remember saying that during a summer drought, the trees emitted more CO2 than they absorbed. Pity I can't find any sources of this, so don't take my word for it.
For plants that have more CO2 to make sugar with, they'll do what animals do- put on more mass. Healthier plants will be able to withstand flucuations in their environment and reproduce either more offspring or healthier offspring. With more plants in an area, it's survival of the fittest, and those who can't survive with their root system will die and decompose.
Higher plant mass would be good for farmers, as it will produce more food in the same area as before, requiring less land needed for farming.
The stoma close if a plant is in dry conditions, mainly to keep water, CO2, and other gases in. If it persists long enough they'll find a way (Biologically expensive) to fix CO2 and other gases into sugar, which can't last forever or the plant will die.