As urgency mounts to curb rising global temperatures and emissions , reducing methane offers the world a "climate emergency break," said Martina Otto, head of the UN Climate and Clean Air Coalition.  Although more short-lived in the atmosphere than carbon dioxide, methane is over 80 times more potent at trapping heat over a 20-year time span and is responsible for around a third of global warming.     And while recent years have seen some progress in reducing the amount of the gas escaping into