Cover

Ozone Depletion

By marialuninggg

  • Chloroflourocarbons were first created

    Chloroflourocarbons were first created in 1928 as non-toxic, non-flamable refrigerants, and were first produced commercially in the 1930's by DuPont. The Ozone Hole

  • Ground based measurments were first started

    The Ozone HoleGround based measurements of Ozone were first started in 1956, in at Halley Bay, Antarctica.

  • Scientists discovered harmful effects of CFC's

    CFC's do not disolve in the rain and there is no natural process that will be anle to remove the compunds of CFC

  • CFC's and Cholrine cause ozone loss

    Aircraft measurements in the late 1980s confirmed the link between CFCs, chlorine, and ozone loss.

  • CFC's Banned

    About 90 percent of CFCs currently in the atmosphere were emitted by industrialized countries in the Northern Hemisphere, including the United States and Europe. These countries banned CFCs by 1996, and the amount of chlorine in the atmosphere is falling now. But scientists estimate it will take another 50 years for chlorine levels to return to their natural levels.

  • CFC production ends world-wide