Azolla? Key to climate moderation?

A fern appears to have affected climate 55 million years ago. It was really hot and carbon dioxide in the atmosphere was much more abundant than before and since. Then, it suddenly went cool... Why? Fern bloom!
Click part 1 then  part 2. [Thanks to foxnews.com (Scroll down to: With your second cup of coffee), Scientific American.com and eenews.net]


There are several other links to the researchers' project pages:

http://pryerlab.biology.duke.edu/

http://pryerlab.biology.duke.edu/field-work 

https://experiment.com/projects/azolla-a-little-fern-with-massive-green-potential