All season, we’ve been unpacking the controversial ways we’re messing with nature to save the planet. In this episode, we explore the wildest intervention to date: de-extinction. Colossal Labs is the $10 billion Dallas-based startup that’s on a mission to bring animals back from extinction. CEO Ben Lamm gives us a tour of the facility, where scientists are busy sequencing ancient mammoth DNA, engineering pigeons into dodos, and building what might be the world’s most ambitious Plan B for a planet in ecological freefall. “I don't think that human-caused climate events are going to slow down, and so I do think it's important that we have mitigation strategies against that, which includes de-extinction tools,” Lamm explained. “I'd rather have a de-extinction toolkit and not need it than need a de-extinction toolkit and not have it.”But not everyone agrees. “De-extinction, you know, that's a form of nostalgia; we're just going to bring these things back, and everything's going to be just the way it was. Well, that's, you know, obviously not true,” said Elizabeth Kolbert, Pulitzer Prize-winning journalist and author of “Under a White Sky.” Kolbert has spent a long time reporting on an uncomfortable pattern: every time humans try to “fix” nature, we tend to create a new mess that needs fixing.