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Sources:
http://theazollafoundation.org/
http://www.scientificamerican.com/article/can-the-fern-that-cooled-the-planet-do-it-again/
http://link.springer.com/article/10.1007%2Fs00374-002-0452-x?LI=true
https://experiment.com/projects/azolla-a-little-fern-with-massive-green-potential
http://www.azollagenome.net/our-goals.html
http://ngm.nationalgeographic.com/ngm/0505/resources_geo.html
http://www.scientificamerican.com/article/how-scientists-uncovered-arctic-clues-to-a-past-where-a-tiny-fern-changed-the-planet/
http://onlinelibrary.wiley.com/doi/10.1111/j.1472-4669.2009.00195.x/abstract
IMAGES: Azolla: https://commons.wikimedia.org/wiki/File:Azolla_caroliniana.jpg
https://commons.wikimedia.org/wiki/File:Azolla_caroliniana0.jpg
https://commons.wikimedia.org/wiki/File:Azolla_filiculoides_MUN.jpg
Anabaena: https://commons.wikimedia.org/wiki/File:Anabaena_circinalis_phv.jpg