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Fuel Cells
Fuel cells convert the fuel (e.g., by combining hydrogen and oxygen) into electricity and will do so for as long as the fuel supplies exist.
Your house or office will eventually have a fuel cell to replace the conventional furnace, providing heat and electricity. Fuel cells produce electricity through electrochemical reactions similar to a battery. Fuel cells, however, can constantly produce electricity as long as a source of fuel exists whereas a battery needs to be recharged. Since a fuel cell does not store energy internally, it doesn't run down like a battery does.
Fuel cells are more efficient than combustion engines because they do not operate with a thermal cycle. Consequently, fuel cells can have very high efficiencies in converting chemical energy to electrical energy. For this reason, fuel cells are highly attractive sources of electrical power, particularly with declining fossil fuels and increasing co2 emissions. In the future, fuel cells will soon power cars and trucks that emitt nothing more than water vapor. Fuel cells will power cell phones and laptop computers for days instead of hours.