'. . . there are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know.' Donald Rumsfeld 12th February 2002.
|Number of pages||11|
|Journal||Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences|
|Early online date||3 Sep 2018|
|Publication status||Published - 8 Oct 2018|
- Climate change
- Unknown unknowns