Ozone Hole Shrinks by Nearly a Third By Jason Mick

After reaching a record high in 2006, scientists at the European Space Agency (ESA) reports that the ozone hole decreased by nearly a third in 2007.  The agency also warned that the decrease is not a sign of permanent recovery, based on their research.

Ozone (O₃) is a compound found in Earth's upper atmosphere.  It is found in high concentrations in the titular ozone layer which is part of the stratosphere.  The ozone layer, first recognized in 1985, provides the essential function of protecting the Earth from harmful ultraviolet (UV) radiation. 

The global ozone layer has been thinning at a rate of 0.3% per year.  UV radiation causes genetic mutation in exposed tissues, which has led to an increased risk of cataracts and skin cancer as well as damage to marine life.

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