The authors, David Denkenberger and Joshua Pearce, claim alternate food sources could feed everyone even if the sun is blocked by a catastrophe such as nuclear winter, supervolcano eruption, or large asteroid/comet impact. The book focuses on what is technically possible and assumes global cooperation. The solutions also address crises including abrupt climate change, super weeds, super crop pests (animals, e.g. insects), super bacteria (e.g. disrupts beneficial bacteria) and super crop pathogens. Ruminants and other grazers can digest dietary fiber, but do not have enough offspring to feed everyone within five years.D.C. Denkenberger and J. M. Pearce. Feeding Everyone No Matter What: Managing Food Security After Global Catastrophe, Elsevier, San Francisco, 2014, pp. 71-72.
