The recyclability of biological materials may also expose them to degradation by other organisms and environmental conditions 572 , eventually requiring protection layers to meet industrial standards. Interestingly, spiders create a natural coating on their silk 573 , limiting protease digestion 574 . Aquatic species even keep their silk dry with hydrophobic motifs 575 , inspiring self-assembled composite materials. Biological systems not only grow materials but also composite structures and living machinery. This opens new avenues for self-organized devices, such as insulin-producing organoids transplants for pancreatic applications 576 or high specific surface electrodes for batteries 577 . Taking inspiration from the electrocytes in electric eels, high density batteries 578,579 may eventually be self-organized using an organoid approach. Devices could also be grown by synthesizing multiple materials at different locations simultaneously. For instance, existing anatomies may be edited to express exogenous materials in specific tissues using cell-specific promoters . Biohybrid solar cells 582 may eventually be grown to harvest electricity from photosynthesis . Synthetic biology can also improve the carbon capture in algae 585 and could be applied to trees 586 for bioenergy and carbons storage 587 . These advancements raise ethical questions explored in the next section 588 .