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Potentially (ok - not currently), “24 gigatons of carbon accumulated in methane hydrates” is a serious amount. Note that as methane increases in the atmosphere, it’s lifetime increases as oxidising capacity is used up, a positive feedback. Methane may also help explain the rapid at the ends of ice ages (when sea-level rose ±100m). If there’s any really bad runaway warming scenario, it has to do with methane.
It seems the problem is the regional governments , which are prioritising regional coal mining, to prioritise regional jobs. In China there is plenty of renewable energy capacity but the sun and wind are mainly in the W and S, while the old coal mines are in the E and N. China has plenty of climate scientists and diplomats pushing central government policy, but these have less influence on ‘local government’. As many ‘local governments’ in China govern populations larger than European countries, this is something like Poland trying to keep it’s coal mines alive, in contradiction to European climate policy. Eventually there will be surplus energy, some coal contracts are going to break, question is who wins and loses then. Western observers tend to think of China as a big centrally controlled monolith - it isn’t, the ‘local’ chiefs have a lot of power. Similar central / ‘local’ governance problem with housing bubble and debt.