21.   Schoeberl said that the amount of CFCs in the atmosphere have stopped increasing, but the chemical has a long lifetime.

22.   The chemical has side-effects on humans, especially those with cardiovascular problems and diabetics.

23.   The original studies tested the suggestion that the chemicals could have had a role in an increased incidence of breast cancer in the northeastern United States.

24.   Scientists later discovered the chemical had the potential to cause cancer.

25.   The amount of CFCs in the atmosphere is no longer increasing but the chemical has a long lifetime, Shoeberl said.