Just 5% to 10% of the sunlight they receive gets converted into energy. So if humans are going to photosynthesize, we'd better get good at it. We would probably evolve to become a lot bigger to absorb enough light to feed and grow.
The series "Imaginary Earths" speculates what the world might be like if one key aspect of life changed, whether related to the planet or humanity.
Green skin is common in science fiction, from little green men to Hera Syndulla from "Star Wars Rebels" to Gamora from "Guardians of the Galaxy." But what if green skin were not just for fictional aliens? If humans had green skin, for instance, what if it granted us the ability to perform photosynthesis, which plants use to live off of sunlight?
Let's analyze what science says about similar abilities in other animals and ask award-winning science-fiction author John Scalzi how he thinks humans might hypothetically benefit from photosynthetic skin.
Lipids are good for making the cell membrane because they are stronger and block out things that should not be getting in out, for instance lipids mainly only let water and gases pass through.
