08 July 2021, Rome, Italy - (Composite photo) From top let: Anne Mullen, Moderator, Chief Editor, Nature Food; Ertharin Cousin, Founder and CEO, Food Systems for the Future; Urs Niggli, Honorary professor, Kassel University; Shakuntala Thilsted, Global Lead, Nutrition and Public Health, WorldFish, and 2021 World Food Prize Laureate; David Zilberman, Professor, Department of Agricultural and Resource Economics, University of California at Berkeley, during the Science Days for the UN Food Systems Summit 2021. Plenary Session - Session 4: Why the fight: Getting to grips with missed opportunities and contentious issues in science and innovation for food systems.