A heat pump uses renewable energy sources by transferring heat from the ground, lake water or the air. The number of heat pumps in Sweden has increased dramatically since the 1990s, which has contributed to less energy being used for heating and hot water in buildings. .
Ethanol research began in the 1980s, and Sweden has been among the world leaders in this field. But the environmental benefits compared with petrol have been much debated since fertile. .
Using hydrogen is another potential means of decreasing carbon dioxide emissions. Among with many other countries, Sweden is looking into the possibility of using hydrogen as fuel, or for electricity or heating. .
So-called passive houses are built without conventional heating systems and are kept warm by the heat given off by their occupants and electrical. [pdf]
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