KIGALI, Rwanda: World envoys reached an agreement Saturday on a timetable for the phase-out of potent greenhouse gases used in refrigerators and air conditioners, a major step in curbing global warming.

The amendment to the 1987 Montreal Protocol on protecting the ozone layer was greeted by applause from exhausted envoys who had worked through the night in the Rwandan capital Kigali to put the final touches on the deal to phase out production and consumption of hydrofluorocarbons (HFCs).

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