New York's former mayor and Vancouver's mayor Gregor Robertson are pushing for climate change policies at the city level.
Delegations meet for the first time in Ethiopia to try to negotiate and end to the violence in South Sudan, but the fighting there continues.
The violence has exposed the ethnic rivalry between the country’s two largest ethnic groups, the Dinka and the Nuer.
The country’s president is Dinka, his rival the former vice president is Nuer.
So far more than 1,000 people have been killed and nearly 200,000 have been displaced by the fighting.
Gregory Warner, NPR’s East Africa correspondent, joins Here & Now’s Robin Young to discuss the latest from South Sudan.