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The emergence of the plankton, which incorporate carbon dioxide into calcium carbonate shells, created a new stability in the planet's carbon cycle, argue Andy Ridgwell, at the University of Riverside, California, and his colleagues. The minute organisms did this by providing for the first time a way to dump calcium carbonate into the deep waters below the open oceans.

Save Bhumi...

save Bhumi:

From the perspective we get on Earth, our planet appears to be big and sturdy with an endless ocean of air. From space, astronauts often get the impression that the Earth is small with a thin, fragile layer of atmosphere.