Blue Planet Biomes—Tundra – http://www.blueplanetbiomes.org/tundra.htm
This site describes the tundra, including global position, climate, and information about specific plants and animals.
Arctic Theme Page – http://www.arctic.noaa.gov/
This National Oceanic and Atmospheric Administration site provides Arctic information and a set of reputable indicators that describe the present state of the Arctic ecosystem and climate.
Lichens – https://www.fs.usda.gov/wildflowers/beauty/lichens/index.shtml
This site from the U.S. Forest Service is all about lichens!
