很明显，在第四纪，冰层已经历过生长和消融的多个阶段。
It's evident that the ice sheets have gone through multiple stages of growth and retreat over the course of the Quaternary.
今天，世界上的冰川正在消融，并且随着全球变暖速度消融的越来越快。
Today, the world's glaciers are in retreat, sped up by relatively rapid warming of the globe.
他说：“人类保护全球冰川，或者说保护自己的速度赶不上冰川消融的速度。”
"The world's glaciers are now melting faster than human progress to protect them - or us," he said.
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