Officials say the first talks among governments about how to limit the use of hydrofluorocarbons have been promising, but countries have yet to agree on how to tackle the problem and whether it should be linked to major negotiations for a new climate treaty.
The four-day talks, involving about 190 countries, ended Saturday.
The United Nations' current ozone treaty, known as the Montreal Protocol, has promoted using HFCs as an ozone-friendly...
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