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Questions tagged [coal]

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4
votes
3answers
73 views

Impact of ash from barbecue on compost heap

I wonder of the impact ash (probably combined with still existing coal) might have to compost. I know that coal is used to clean water and air. But does it improve compost or does it reduce activities ...
5
votes
1answer
144 views

Are crypto currencies sustainable?

Except generating a different kind of "money value", what is the sustainable value of crypto currencies compared to the energy consumed to generate them? Compared to currencies working with ...