IN CONTEXT

KEY FIGURE

Joseph Farman (1930–2013)

BEFORE

1974 American chemists Frank “Sherry” Rowland and Mario Molina suggest that chlorofluorocarbons (CFCs) destroy atmospheric ozone.

1976 The US National Academy of Sciences declares that ozone depletion is a reality.

AFTER

1987 The Montreal Protocol on Substances that Deplete the Ozone Layer, a global treaty to phase out CFCs and similar chemicals, is agreed.

1989 Montreal’s worldwide ban on the production of CFCs comes into effect (ratified by the EU and 196 states to date).

2050 The year in which ozone over the Antarctic is predicted to return to pre-1980 levels; however, other harmful ...

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