The Montreal Protocol of 1987 continues to be a success story about international environmental cooperation.
A rise in atmospheric levels of CFC-11, a substance banned by the Montreal Protocol, prompted environmental investigators to find the source.
Its most recent victory is a phase-out on HFCs, a powerful greenhouse gas.
Hydrofuorocarbons replaced the chemicals that were depleting the ozone layer, but they are a potent greenhouse gas, up to 10,000 times stronger than carbon dioxide.
Ozone-destroying chlorofluorocarbons were banned in 1989 but the chemicals that replaced them in refrigerators and air conditioners are contributing to global warming.
We banned ozone-depleting chemicals and replaced them with ones that increase global warming.
The garbage dump in the tiny Canadian town of Iqaluit has been visibly on fire for two months — and has been burning all year.