A Novel Tactic in Climate Fight Gains Some Traction

With energy legislation shelved in the United States and little hope for a global climate change agreement this year, some policy experts are proposing a novel approach to curbing global warming: including greenhouse gases under an existing and highly successful international treaty ratified more than 20 years ago. The treaty, the Montreal Protocol, was adopted in 1987 for a completely different purpose, to eliminate aerosols and other chemicals that were blowing a hole in the Earth’s protective ozone layer. But as the signers of the protocol convened the 22nd annual meeting in Bangkok on Monday, negotiators are considering a proposed expansion in the ozone treaty to phase out the production and use of the industrial chemicals known as hydrofluorocarbons or HFCs The chemicals have thousands of times the global warming potential of carbon dioxide, the most prevalent greenhouse gas. HFCs are used as refrigerants in air-conditioners and cooling systems. They are manufactured mostly in China and India, but appliances containing the substance are in use in every corner of the world. HFCs replaced even more dangerous ozone-depleting chemicals known as HCFCs, themselves a substitute for the chlorofluorocarbons that were the first big target of the Montreal process...more