His quote about Miami is truncated in order to completely misrepresent it. As another commenter mentions, he actually said ""Who cares if Miami is six metres underwater in 100 years? Amsterdam has been six metres underwater for ages, and that’s a really nice place. We will cope with it."
Remember that this was a speech on climate risk aimed at investment bankers. He did not deny or dismiss climate change, but expressed his opinion that the risk (mainly to the economy and financial markets) is much lower than usually claimed.