Startup Skyonic is testing technologies that transform captured CO2 into bicarbonates, acids, even limestone. The big question: Can they be scaled?
Factory-farmed eggs require more energy to produce than milk and swine, combined. That's just one of the economic arguments inspiring Hampton Creek's quest to create a plant-based egg alternative.
If we caused species to go extinct, some say we have an obligation to try to revive them. But that could have unintended consequences.