China's vast bitcoin mining empire risks derailing its climate targets, says study

China powers nearly 80% of the global cryptocurrencies trade, but the energy required could jeopardise its pledge to peak carbon emissions by 2030 China's electricity-hungry bitcoin mines that power nearly 80% of the global trade in cryptocurrencies risk undercutting the country's climate goals, a study in the journal Nature has said. Bitcoin and other cryptocurrencies rely on "blockchain" technology, which is a shared database of transactions, with entries that must be confirmed and encrypted. ...