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This paper emphases the synergistic nature of greenhouses, underlining their role in feeding the population and optimizing energy, water, and gas fuel consumption. Several synergies associated with greenhouses are listed: that of recoverable energies, that of water, that of carbon offset, that of trophics, that of economics and that of politics. The most significant greenhouse configurations are reviewed: the passive greenhouse, oper-ating exclusively with renewable energies, the cogenerating greenhouses, producin...

The paper proposes a new strategy against the global warming, which if applied on large scale is able to turn our cities into green oasis, decreasing their actual carbon foot-print and increasing their carbon offset. Our approach is to replace conventional roofs with integrated rooftop greenhouses IRTG, which are connected with the interior of the building by controlled flows of energy, oxygen, carbon dioxide and water. The main IRTG feature is the tight human-plant symbiosis ensured by a two flows ventilation sys...