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Description
Kerry feels 'very positive' after meeting on phasing out HFCs Envoys from nearly 200 nations met in the Rwandan capital to thrash out an agreement to phase out hydrofluorocarbons (HFCs), which were introduced in the 1990s to save the ozone layer -- but turned out to be catastrophic for global warming. US Secretary of State John Kerry said he felt "very positive" before departing for the airport. IMAGES AND SOUNDBITES