Global warming is depleting fresh water and crops, destroying coral reefs and melting the Arctic, the UN has warned in a report that concludes the world is ill-prepared to face many new threats.

Climate change is set to push up food prices, increase hunger and reduce the quality of food, campaigners warned ahead of the publication of a key scientific review of global warming.

Climate change will push up food prices, increase hunger, and reduce the quality of food, campaigners warned ahead of the publication of a key scientific review of global warming.