I remember a novel by Stanisław Lem in which he talks about a planet which has an atmosphere with a green tint. It is caused by swarms of insects in the atmosphere doing photosynthesis. I don’t know whether that would be realistic, but it’s currently not possible on Earth, insofar no insects, nor any other animal, ever developed the ability to do photosynthesis.
There are actually atmospheric microbiota, also called aeroplankton, though those are mostly bacteria.
I remember a novel by Stanisław Lem in which he talks about a planet which has an atmosphere with a green tint. It is caused by swarms of insects in the atmosphere doing photosynthesis. I don’t know whether that would be realistic, but it’s currently not possible on Earth, insofar no insects, nor any other animal, ever developed the ability to do photosynthesis.
There are sea slugs that photosynthesize, but that’s with chloroplasts they steal from the algae they eat.
And coral has symbiotic algae growing inside which photosynthesize for them.