How safe and clean is geothermal?

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The EPA and the U.S. Department of Energy recognize geothermal systems as the most environmentally friendly way to heat and cool. Unlike other comfort systems, geothermal does not emit carbon dioxide, carbon monoxide, or other greenhouse gasses which contribute to air quality pollution. There is no combustion in a geothermal heat pump; therefore there is no chance of carbonmonoxide poisoning. By adding high efficiency air cleaners with geothermal, a high indoor air quality level can be reached.