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"I myself feel that our country, for whose Constitution I fought in a just war, might as well have been invaded by Martians and body snatchers."
- Kurt Vonnegut, Jr.

Chlorophane  
  Similar to chlorophyll but synthetic and far more efficient.  

Chlorophane, like the chlorophyl of green plants, could break up exhaled carbon dioxide, freeing the oxygen for re-breathing. But it was synthetic, far more efficient, and it could use much stronger sunlight as an energy source. Like chlorophyl, too, it produced edible starches and sugars that could be imbibed, mixed with water, through a tube inside the Archer's helmet...

The small nuclear battery which energized the moisture-reclaimer, the heating units, and especially the air-restorer—not only for turning its pumps but for providing the intense internal illumination necessary to promote the release of oxygen in the photosynthetic process of the chlorophane when there was no sun—had been replaced by a chemical battery of a far smaller active life-span!

From The Planet Strappers, by Raymond Z. Gallun.
Published by Pyramid Books in 1961
Additional resources -

In the non-fictional real world, chlorophane is a variety of fluorite, which, when heated, gives a striking emerald-green thermoluminescent light.

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