Another twist in the mining debate - but not Bitcoin mining, it's conventional mining this time - and instead of a positive twist, it's a negative one.

New research finds that ancient carbon in rocks releases as much carbon dioxide as the world's volcanoes

Excerpt
New research has overturned the traditional view that natural rock weathering acts as a CO2² sink that removes CO² from the atmosphere. Instead, this can also act as a large CO² source, rivalling that of volcanoes. The results have important implications for modelling climate change scenarios but at the moment, CO² release from rock weathering is not captured in climate modelling. Future work will focus on whether human activities may be increasing CO² release from rock weathering, and how this could be managed.