A global agreement on cutting the use of hydrofluorocarbons (HFCs) - potent greenhouse gases used in aerosols, refrigerants and air conditioning - seems within grasp, delegates said after 10 days of talks on climate change in Vienna.

A final deal is expected to be reached at a meeting in October in Kigali, Rwanda. If successful, it would be the biggest single measure to limit global warming since governments adopted the Paris Agreement last December, seeking to limit heat waves, floods, droughts and rising seas. At the Vienna…