global disasters will provide a decrease in crypto and bitcoin values because many people will try to meet their basic needs of eating, drinking and treatment rather than having to think about investment and others, with a decrease in trading volume due to this global disaster the market will experience a decline in purchasing power which ultimately causing crypto prices to also decline
Will reduce the value of bitcoin, because people's purchasing power also goes down. Basic needs will be a priority compared to investment or trading in bitcoin. Usually global disasters will be accompanied by high inflation because state finances are also sucked in to cope with the disasters that occur.