2022 https://books.google.com/books?hl=en&lr=&id=RjFrEAAAQBAJ&oi=fnd&pg=PT10&dq=%22global+catastrophic+risk%22&ots=_Q_DFbqlFR&sig=8IUQt5NuJEelMhJxhPpMz1D3WeI Medium
2022 https://books.google.com/books?hl=en&lr=&id=RjFrEAAAQBAJ&oi=fnd&pg=PT10&dq=%22global+catastrophic+risk%22&ots=_Q_DFbqlFR&sig=8IUQt5NuJEelMhJxhPpMz1D3WeI Medium