In a rapidly warming world the need to keep some things cold is growing more difficult and increasingly urgent.
Public health officials estimate that millions of vaccine doses are wasted each year, largely because in many parts of the world there is no way to keep them cold.
And a United Nations report presented this week to the U.N. climate summit in Sharm El-Sheik, Egypt, estimates that nearly a third of all the food produced for human consumption is lost or wasted, a lot of it because of spoilage.
Much of this waste, which results in billions of dollars of lost income, is in large part because farmers in the developing world lack the technology to quickly cool their harvested crops and keep them fresh for the market.
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