Natural gas produces about half the CO2 emissions per unit energy as coal. (And presumably less other harmful stuff like radioactive fly ash.) https://www.eia.

Natural gas produces about half the CO2 emissions per unit energy as coal. (And presumably less other harmful stuff like radioactive fly ash.) https://www.eia.gov/tools/faqs/faq.php?id=73&t=11 https://www.eia.gov/tools/faqs/faq.php?id=73&t=11