‘The [1997] Montreal protocol sought to limit damage to the stratospheric ozone layer that protects the planet from harmful ultraviolet radiation. The protocol phased out substances such as chlorofluorocarbons (CFCs), coolants in devices ranging from air conditioners to refrigerators, which deplete the ozone. They also contribute to global warming. The Vienna Convention for the Protection of the Ozone Layer [was] the UN agreement accompanying the Montreal protocol. No other environmental initiative has achieved as much. Ozone-depleting chemicals in the atmosphere reached their zenith in 1994. The concentration of ozone in the atmosphere should be back to what it was before 1980 by the middle of this century, studies suggest. America’s Environmental Protection Agency estimates that up to 2m cases of skin cancer may be prevented globally each year until 2030 because of it,’ (‘Mostafa Tolba’, The Economist 02nd April 2016, p78).