Earth's glaciers lost 9 trillion tons of ice. That's the weight of 27 billion 747s.

Nine trillion metric tons. That's how much ice Earth's glaciers lost in the 55 years between 1961 and 2016. An international team of scientists used satellite and direct field observations to conclude that Earth's glaciers have melted such a profound sum of ice in the last half-century. They published their report Monday in the journal Nature.

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