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Electricity does not have damage the climate. Take wind power, or nuclear as examples. Or geothermic stuff.

but can you build and maintain a wind turbine without using fossil fuels?

Or mine and refine uranium?

Total lifecycle analysis is complicated, and important in these questions.

The lifecycle analysis is necessary. I guess the answer to your questions can be Yes.

Sadly, it's easier said than done.

Indeed. Although the problems with nuclear are mostly `ethical' (or very long-term technical).