China's top legislature has ratified the Paris global climate agreement, state news agency Xinhua reports.

The country is the world's largest emitter of harmful CO2 emissions, which cause climate change.

China and the US were expected to announce ratification jointly before or at the weekend's G20 Hangzhou summit.

In a landmark deal struck in December, countries agreed to cut emissions enough to keep the global average rise in temperatures below 2C.

(BBC)