Uranium mining isn't clean at all. Between Greenpeace (full of business school hacks) and lobby pressured EU courts, there's a middle ground.
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I mean it's not clean
>one of the lowest impact mining of resources we have
Not the point. It's not clean, it shouldn't be called clean end of the story.
Using systematic metrics to annoint something as clean so it can get clean energy credits so that people can invest in activities considered cleaner is valuable and useful even if none of the options are 100% perfectly in impactful to the natural world.