Climate change report: five key points

The world faces threat to food supply, conflicts over water rights and growing inequality. The only option to is cut emissions

Climate change is already taking a sizeable chunk out of global food supply and it is going to get worse. Increases in crop yields which are needed to sustain a growing population have slowed over the last 40 years. Some studies now point to dramatic declines in some crops over the next 50 years especially wheat, and to a lesser extent corn. Rice so far is unaffected. The shortages, and the threat of food price spikes, could lead to unrest.

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