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40.

Is nuclear energy truly clean?

It depends on the definition of 'clean'.

If 'clean' means low CO2 emissions and low air pollution, nuclear is among the low-emission sources according to the IEA, IPCC, and UNECE. If 'clean' means free from any impact whatsoever, then no: waste, mining, water use, decommissioning costs, and accident risk exist. The more precise formulation is: a low-emission source, not an impact-free source.