out all that money truckers invested in environmentally friendly
air-conditioner systems has paid off.
Christian Science Monitor reported recently that the ozone layer
in the stratosphere, which shields humans from harmful ultraviolet
rays in sunlight, is showing signs of recovery. Years ago, many
scientists said that the layer was shrinking, and even identified
a hole in the layer centered over Antarctica. Those scientists claim
the hole – and the overall shrinkage of the ozone layer – was caused
by humans’ use of chlorofluorocarbons, also called CFCs, and other
1995, all air-conditioning systems used R-12 refrigerant, also known
as Freon. Today, all new vehicles use R-134a, which contains fewer
chlorofluorocarbons (CFCs) than R-12. Although some older vehicles
still on the road use the pre-1995 coolant, even many older vehicles
have been converted to use the lower CFC coolant.
use of CFCs was limited by an international document called The
Montreal Protocol in 1987, The Monitor reported.
Newchurch, an atmospheric chemist at the University of Alabama at
Huntsville, told the newspaper the reversal of ozone layer destruction
was "the most significant environmental success story of the