Evoluční odpovědí rostlin na snížení koncentrace CO2 v atmosféře byla změna tvaru (zvětšení poměru velikosti povrchu k objemu) a zvýšení hustoty a velikosti průduchů. Hustota průduchů je relativně spolehlivým svědectvím antropogenních změn koncentrace CO2 v atmosféře. Správné rozmístění a množství průduchů odpovídající prostředí, kde rostlina roste, je věc přenosu informací mezi atmosférou v okolí listu a jádrem buňky. Další mechanismy, které řídí přenos informací mezi orgány rostlin dosud neznáme.

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Change in leaf form, the proportional enhancement of density and a decrease in the size of stomata are the evolutionary reaction of plants to the lowering of CO2 concentration in the atmosphere during the geological history. The density of stomata is a relatively reliable witness of CO2 concentration changes in the atmosphere caused by man’s activities. The correct spatial distribution and quantity of stomata corresponding to the environment in which a plant is growing involves information transfer between the atmosphere around a leaf and a cell nucleus. Other mechanisms regulating the transfer of information among plant organs have recently been revealed.