Last-minute discussions about carbon markets delayed the closure of the conference by a day.

Delegates believe the new rules will ensure that countries keep their promises to cut carbon.

The Katowice agreement aims to deliver the Paris goals of limiting global temperature rises to well below 2 degrees Celcius.

The common rulebook envisages flexibility for poorer nations.

The idea of being legally liable for causing climate change has long been rejected by richer nations, who fear huge bills..