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In his otherwise excellent review of Thane Gustafson’s book The Bridge, Andrew Moravcsik includes nuclear power in his list of energy sources to which natural gas is “environmentally superior” (Nature576, 30–31; 2019). Burning natural gas in fact releases almost half as much carbon dioxide into the atmosphere as does coal. Nuclear power production itself releases none. Taking into account the CO2 released from fossil fuels burnt during plant construction and uranium mining and processing, nuclear energy ranks about equally with solar power — so still much less polluting than natural gas.