'Past a point of no return': Reducing greenhouse gas emissions to zero still won't stop global warming, study says

Even if human-caused greenhouse gas emissions can be reduced to zero, global temperatures may continue to rise for centuries afterward, according to a scientific study published Thursday.

"The world is already past a point of no return for global warming," the study authors report in the British journal Scientific Reports. The only way to stop the warming, they say, is that "enormous amounts of carbon dioxide have to be extracted from the atmosphere."

The burning of fossil fuels such as oil, coal and gas release greenhouse gases such as carbon...