PARIS -- Humanity seems to be reaching a turning point in its emissions of greenhouse gases. Last year marked the third in a row that global emissions of carbon dioxide trended sideways, ending what had been a long, unbroken climb interrupted only by the 2008 financial crisis.
The change is thanks in large part to a shift from coal to natural gas and renewable energy resources. Even the United States, led by a new administration whose leaders are skeptical at best about climate change, is not expected to significantly increase its carbon emissions. And policies put in place by emerging economies are beginning to take effect.