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Yes, there's an alternative. Plants using chlorophyll must, to the best of my knowledge, take in CO2 and put out oxygen. So chlorophyll is a no-no. Fortunately, not all photoautotrophs use chlorop...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:43Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/11494 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/