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With the help of renewable energy, which in turn is the result of natural processes, the ecosystems that most people try to use precisely for their purposes are improving. Emerging energy markets and geopolitical uncertainty have brought energy security and energy infrastructure sustainability to the forefront of many national energy strategies. Security of supply is a major concern in global energy markets, from the European Union and the United States to Egypt and India. Examples of the use of renewable energy in buildings are solar water heaters, biomass boilers, heat pumps and free cooling.