Shall we be optimistic or pessimistic? It depends on what we and concerned people throughout the world do to put a lid on climate change. Heat over 90° is pretty dangerous, especially to those who must work outside; but just think, in the worst scenario below by the end of the century, of over 160 days a year of temperatures over 90°… up to and including over 105°!

Chart from Chester County Climate Action Plan draft – 2021, page 69: