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As for emissions, there are a few critical indicators that you need to account when reading such articles:

Life-cycle CO2 intensity which includes emissions per unit of energy (kWh) over the plant’s whole life, from construction, operations and decommissioning https://en.wikipedia.org/wiki/Life-cycle_greenhouse_gas_emissions_of_energy_sources

For global metrics, the IPCC 2014 data is used. For EU, UNECE 2020 data is much more up to date.

For #nuclear, the CO2 intensity is on average 12 gCO2eq/kWh per IPCC 2014 but only 5.1 gCO2eq/kWh per UNECE 2020, because their study measured only the plants operating in EU which are relatively new and were built to higher environmental standards.

Note that the concept of life-cycle emissions was introduced specifically in order to capture everything, so for example also emissions from production of the concrete for construction. Which is one reason why hydro power is surprisingly high - during operations phase hydro does not emit any CO2, but it requires very large amounts of concrete to build, and these emissions are “paid off” during its whole life-time.

The same applies for wind power, which requires a lot of concrete and steel. Wind has relatively high emissions in construction phase, but then the energy output is relatively small and life-time is relatively short, so the denominator of the formula is smaller, so the total emission intensity is higher than nuclear.