Heads of state and government from 150 countries opened the biggest-ever climate summit Monday in Paris, tasked with inking an historic deal to stave off disastrous global warming.

"Through multilateralism we can show to the world that we can work together against climate change and against global terrorism," said the talks' outgoing president, Peru's environment minister Manuel Pulgar-Vidal, two weeks after jihadist attacks killed 130 people in the French capital.