2022 https://books.google.com/books?hl=en&lr=&id=mJVeEAAAQBAJ&oi=fnd&pg=PA203&dq=%22global+catastrophic+risk%22&ots=Cu2BX_epaA&sig=IWlMH1YpF5V9IIp4U_fTZmYf3CQ Medium