Armando Brionez: All of a sudden, you're trying to figure out, "Well, how am I gonna make that paycheck for my family?"Brionez's 'backups' include his new food truck, switching to crab fishing, and consulting on cannabis farms.Paul Ehrlich: Resources that would be required, the systems that support our lives, which of course are the biodiversity that we're wiping out.And by mass extinctions, I mean at least 75%, three quarters of the known species disappearing from the face of the Earth.Tony Barnosky's colleague in the study of extinction is his wife, biologist Liz Hadly, faculty director at Stanford's Jasper Ridge Research Preserve in California."