Optimism trumps despair at climate summit

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Mayors, governors, entrepreneurs, CEOs, investors and celebrities delivered a double-edged message Friday at the close of a climate summit in San Francisco: global warming is making the planet unliveable — but we know how to fix it.

“We are using the sky as an open sewer, it’s insane,” former US vice president Al Gore told the conference, noting that humanity belches 110 million tons of heat-trapping pollution into the atmosphere every day.