The relation between global warming and the role of anthropogenic carbon dioxide (CO2) is confusing. Ocean level and atmospheric temperature rises are predicted dramatic in distant future whereas global ices disappearance is already dramatic and increasing. In this article, we called on the heat control machinery exploited in a refrigerator to show that water behaves as a refrigerant to manage solar and anthropogenic heats and also any heat generated from sources localized on Earth. Year 2018 was taken as example for quantitative evaluation of heat energy transfers involved in water phases and interphase exchanges. It was concluded that ice melting and evaporation-condensation equilibria are efficient physical factors to fight global warming. It is also shown that the pool of water present on Earth is progressively augmented by the water liberated parallel to CO2 during the combustion of fossil hydrocarbons in which it was stored millions years ago. Water as source of hydrogen may be an alternative to the sources of energy produced and consumed by humanity provided that heat-cycle assessment from cradle to grave complements the life cycle assessment favorably.