There is a fern that has such a high level of atmospheric carbon sequestration that it caused an ice age 49 million years ago. Azolla thrived because of the perfect conditions it found to grow in the North Pole. Large amounts of this fern kept growing and falling to the bottom of some sea without being able to decompose for 800,000 years. It reduced the CO2 levels in the atmosphere so much that it became a threat to its own survivability.
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