How glaciers melted 20,000 years ago may offer clues about climate change's effects
New research out of the British Antarctic Survey found thousands of underground channels left by ice age glacial melt. The findings could improve the accuracy of modern-day models of sea level rise.
During Earth's ice ages, much of North America and northern Europe were covered in massive glaciers.
About 20,000 years ago, those ice sheets began to melt rapidly, and the resulting water had to go somewhere — often, underneath the glaciers. Over time, massive valleys formed underneath the ice
