Glaciers in the Antarctic are retreating at an increasing rate, in what scientists said on Thursday was a clear sign of climate change.

Most of the glaciers on the Antarctic peninsula, near the southernmost tip of South America, have retreated over the past 50 years as temperatures have warmed, according to a study from the British Antarctic Survey and US Geological Survey. Inland glaciers appear to be accelerating their descent to the ocean, threatening to raise the sea level.