1950s: In 1955, the London Clean Air Act puts a ban on burning untreated coal. In 1956, Calder Hall in England begins to produce electricity by means of nuclear fuel

1992: The Prime Minister of England announces the intention to close 10 coal mines out of 31 mines that are not viable economically.

1951: The population of Britain is 50 million people; the population of London is 8.4 million.

1990s: In 1992, the population of Britain is 58 million people; in 1991, the population of London is 9 million.