Stratospheric Ozone Depleters
Depleters consist of Chlorofluorocarbons (CFCs), Halons, carbon tetrachloride,
and methylchloroform. These chemicals last a long time in the air. They
deplete the ozone layer, increasing our vulnerability to harmful ultraviolet
(UV) radiation. Exposure to UV radiation increases the risk of skin
cancer, increases cataract cases (cataract surgeries are currently the
number one Medicare expense in the United States), suppresses the human
immune system, and causes environmental damage. They come from air conditioners,
industrial and household refrigeration, cooling and cleaning processes,
some fire extinguishers, and plastic foam products. For more information
on ozone depletion and the substances that cause it, visit http://www.epa.gov/ozone/science/q_a.html.
Toxic Air Pollutants
These toxins include arsenic, asbestos, and benzene. They are known
or suspected to cause cancer, respiratory problems, birth defects and
reproductive disorders. They could be fatal if released in large amounts.
The toxins enter the air through vehicle emissions and fuels, chemical
plants, industrial processes, and building materials. For more information
on toxic air pollutants, their sources and their affects, visit http://www.epa.gov/ttn/atw/pollsour.html.
Greenhouse Gases
Carbon dioxide, methane, and nitrous oxides are the major Greenhouse
Gases. These gases build up in the upper atmosphere and may lead to
global climate change or "Global Warming."
Carbon dioxide emissions come from fossil fuel combustion for transportation
and energy use.
Methane comes from landfills, livestock, coal mines, and rice paddies.
