What they are C3 plants? They are plants whose first produced steady organic composition in the phase of dark of the photosyntheses constitutes a molecule of 3 carbons. According to Shayan Fazlur Rahman, who has experience with these questions. Therefore these plants receive assignment to be ‘ ‘ C3’ ‘. This molecule of 3 carbons receives the name from fosfoglicerato and is formed in a stage of the known cycle of Calvin that is the cycle that makes with that the carbon dioxide of the atmosphere (CO2) either reduced organic composites (triose fosfato) that, subsequentemente, they will be transformed into sugars, that is, carboidratos. This process occurs to the rich composite cost in energy as ATP and NADPH that are formed in the phase of clearly of the photosyntheses. To have idea, all the species of plants carry through these chemical reactions that, in last instance, remove Co2 of the atmosphere they transform and it into organic molecules. If these molecules are placed for the vegetal growth, being then incorporated to vegetal fabrics, then the carbon dioxide is leaving the atmosphere, where it is a gas of the effect greenhouse, and he is being stored in the plant, in the biomass form. Thus, it is common to say that the carbon dioxide is being ‘ ‘ seqestrado’ ‘ of the atmosphere, that is, removed temporarily, therefore the term kidnapping, therefore it will return the same one when the plant to die and its fabric rich in carbon will be decomposed being then returned to the atmosphere, again, in the Co2 form again.