This is very blatant lie, because you can actually check scientific publications and find out what was actually being discussed and predicted.
But it wasn't just the scientists. The idea of global warming had penetrated popular culture to the extent that at least three British science fiction writers tackled it. Bob Shaw in Medusa's Children (1977); Christopher Priest (rather peripherally) in A Dream of Wessex (1977); and Richard Cowper in The Road to Corlay (1978). The latter has a map on the inside cover. As you can see, Cowper's prediction of sea level rise was fairly drastic, but - given that it must have taken a few centuries - not unreasonable. Note that, finally, London no longer holds sway over England, as the Smoke has gone the way of Atlantis.
Oh, and all three novels are excellent - well worth reading, despite having aged in a few minor respects.