Although often well-hidden, it is the discovery of advanced metallic materials that enable various technological advances around us. However, the associated rapid change contributes to various natural problems, including climate change. To fight it, we present a strategy that takes such concerns into account already at the alloy design stage: through a deeper understanding of micro-mechanisms of deformation and damage, we design alloys that have the capability to be perpetually and feasibly treated to revert to their original microstructure, and hence original properties. TRIP-Maraging steel, for example, can be deformed and then healed back to its original microstructure and properties, up to three times. Other investigations reveal that various other alloys can also be rendered to increase their healability. The resulting novel class of highly-healable, damage-resistant alloys could enable achieving huge decreases in CO2 emissions since (i) component lifetimes are extended, and (ii) energy-costly scraping-recycling processes are avoided.