Unchecked climate change and land use are setting up a hunger crisis, a new United Nations scientific report warns. But there are steps that can put off the calamity.

With more extreme conditions — July was Earth’s hottest month ever and part of a four-year period at a record high — stable food production is increasingly at risk. That threatens the poorest populations first, but can ripple through the global economy, the Intergovernmental Panel on Climate Change said in its latest installment of a series of reports. The report comes as the UN prepares to meet at a climate-change summit in New York next month.

“The cycle is accelerating,” said NASA…

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