photosynthesizers

But early photosynthesizers sucked up all the carbon dioxide, combining it with water to make carbohydrates, and releasing the oxygen into the atmosphere.

Andy Mannle: Life's Most Amazing Invisible Secrets Andy Mannle 2012

But early photosynthesizers sucked up all the carbon dioxide, combining it with water to make carbohydrates, and releasing the oxygen into the atmosphere.

Andy Mannle: Life's Most Amazing Invisible Secrets Andy Mannle 2012

During the warm times, dolomite was laid down under an atmosphere rich in CO2 while photosynthesizers grew furiously.

Who Do You Say I Am 2010

Of course, as the globe becomes enshrouded in ice, most of the photosynthesizers die.

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Probably through the invention of grazing; if the photosynthesizers are eaten fast enough, they can't draw down the CO2 fast enough.

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With the photosynthesizers killed back, carbon dioxide from the volcanic activity would accumulate in the air.

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A global greenhouse, warm pole to pole -- it's paradise for those few surviving photosynthesizers, who now start growing furiously again ....

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It's easy to imagine settings in which (say) the "invention" of photosynthesis _destroys_ the global environment -- for example, if volcanic action wasn't vigorous enough to replenish the CO2 photosynthesizers destroyed.

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Maybe this happened to Mars: it froze up permanently once photosynthesizers began drawing down the CO2.

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(Conversely, maybe Venus arrived in _its_ present hellish state because photosynthesizers never arose; and so CO2 couldn't be sequestered away fast enough.)

Who Do You Say I Am 2010