UN climate chief: Pledges by big polluters boost Paris hopes

The Dave Johnson coal-fired power plant (J. David Ake/AP)

The UN’s climate chief says deadlines set by some of the world’s top polluters to end greenhouse gas emissions have boosted hopes of meeting the Paris Agreement’s goals

The accord, signed in the French capital five years ago, aims to keep global warming well below 2C (3.6F) — ideally at no more than 1.5C (2.7F).