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Seems to me that greenhouses gain their heat from the glass panels they are built from, which stop the wind from cooling them down.
The ones I worked at supplemented with C02 to enhance the plants growth, very beneficial gas that C02, this should be known as the Global Greening Era. We have an increasing population to feed, crop yields going up from the C02 fertilization effect should be welcomed.
Another study and another set of conflicting data points.