From The Guardian readers' letters page:
Nuclear power is helping to drive the climate crisis
Has the Confederation of British Industry got its head in the sand, or in the record levels of carbon-intensive concrete just poured at the Hinkley C nuclear site (Build more nuclear reactors to help climate crisis, says CBI, 28 June)?
Nuclear power, apart from destroying biodiversity throughout its life cycle, produces up to 37 times the CO2 emissions of renewable energy sources, owing partly to the mining and refining of uranium. The impact of this process on people and the environment is not included in the rationale for nuclear power in the UK...
Linda Rogers, PAWB (Pobl Atal Wylfa B/People Against Wylfa B)
Let's go with the prevailing narrative that today's temperatures are outside the normal range of fluctuations for the past hundred (or thousand, or whatever) years, and that carbon dioxide is causing them - and focus on that "37 times" number.
I don't know what she means by 'renewable energy', but presumably the net carbon dioxide emissions from these is close to zero - thirty-seven times close to zero is still a small number, and surely a few orders of magnitude less burning oil or gas (coal is hardly used any more in the UK).
Therefore, the headline that "Nuclear power is helping to drive the climate crisis" is nonsense. By all means, oppose it for other reasons (rightly or wrongly), but please accept that overall, it reduces carbon dioxide emissions.