Preview: How climate change threatens food

From the BBC World Service: A gathering in South Africa of major economies has ended with a joint declaration committing to "multilateral cooperation." We'll hear more. Plus, India and Canada have agreed to resume discussions on a bilateral trade deal, a three-day national strike is getting underway in Belgium, and the Chinese government is urging young people to spend more to boost the economy — but that’s proving difficult at a time of record youth unemployment.