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The City of Reykjavik, Iceland, can proudly say that its carbon footprint is among the lowest in a high-income country. This is not because of recent action, but because geothermal central heating is used in every house and because all electricity production is 100% renewable, based on geothermal energy as well as hydropower.
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Dagur B. Eggertsson (2021) studied this question.
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