World leaders prepare to sign Paris climate treaty

The first significant step to putting the Paris Climate Agreement into practice will take place on Friday.

Around 155 countries are expected to formally sign the deal at the UN, setting in motion events that could see the treaty operational within a year.

The UN says the expected record turnout for the signing shows overwhelming global support for tackling rising temperatures.

Read More: http://www.bbc.com/news/science-environment-36098310