Guardian: Bill de Blasio, the mayor of New York City, has pledged to reduce his citys carbon footprint by 40% by 2030 in a speech in which he praised Pope Francis who he called the highest moral authority for calling on the world to take bold action on climate change.
The remarks were presented at a rare Vatican meeting of mayors from around the world, who gathered to discuss the environmental challenges facing their cities and the correlation between global warming and modern slavery.
De Blasio,...