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RE: What If We Humans Could Do Photosynthesis Like Plants?
Plants can survive on photosynthesis because they don't move and thus are not required to maintain high body temperature. Animals have much larger energy requirements and thus generally need to eat plants or each other to obtain chemical energy for maintaining their metabolism.
If photosynthesis was adequate for animals, you'd see mobile plants and/or photosynthesizing animals. But they are few and far between. At some point in evolutionary history, animals gave up for photosynthesis altogether. Possibly because of the omnipresence of plant material to consume. But it turns out there are a few animals that can do photosynthesis: the green slug, the spotted salamander and the green aphid.
Yeah, also the calorie requirement is quite high in animals. I wonder if we biohacking can solve the problem you've stated.
Animals have had a billion years to evolve solutions to that.