Already, atmospheric scientists have detected reductions in atmospheric concentrations of a number of ozone depleting chemicals, a positive sign that the 1985 Montreal Protocol to reduce Cfc emissions is working.

BBC: News | Sci/Tech | Ozone hole reaches record size

The Montreal protocol, which banned various ozone-depleting chemicals, has left the ozone layer's long-term prospects looking quite bonny.

ECONOMIST: Geoengineering

They say the case for limiting carbon emissions is every bit as strong as it was for lead, or for ozone-depleting chemicals, or other substances that have been regulated by the EPA over the last three decades.

NPR: Supreme Court Hears Global Warming Arguments