'. . . 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.
CITATION STYLE
Foster, G. L., Hull, P., Lunt, D. J., & Zachos, J. C. (2018). Placing our current “hyperthermal” in the context of rapid climate change in our geological past. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. Royal Society Publishing. https://doi.org/10.1098/rsta.2017.0086
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