Artificial synthesis, saying they can make acetate from electricity at 18x the efficiency of plants, then grow plants with the acetate.
https://news.ucr.edu/articles/2022/06/23/artificial-photosynthesis-can-produce-food-without-sunshine
https://news.ucr.edu/articles/2022/06/23/artificial-photosynthesis-can-produce-food-without-sunshine