The Paris agreement really does change everything

It’s easy to be cynical about pledges on climate change. But the signing of the treaty on carbon emissions sets us on an irreversible path towards clean energyWednesday was a historic day for the climate. No, not another record-breaking hottest month. Not another devastating hurricane. For once, it was a good day. Wednesday was the day enough countries – representing more than 55% of global carbon emissions – ratified the Paris agreement on climate change for the treaty to