The New York Times, March 17, 2014
Signy Island, which lies 375 miles off Antarctica, has too harsh an environment to support a single tree. Its mountains are girdled instead by banks of moss.
“It’s just like a big, green, spongy expanse,” said Peter Convey, an ecologist at the British Antarctic Survey who has worked on Signy Island for 25 years.
Only the top inch of the moss banks is growing. The lack of sunlight turns the older moss brown, and eventually it becomes permanently frozen. Blankets of permafrost have grown on the island for thousands of years, since the glaciers retreated at the end of the last ice age.

