Global demand for high-quality animal-sourced protein is expected to rise substantially over the next 2 decades as population grows and global household incomes rise. Simultaneously, climate experts are calling for a rapid transition away from animal-derived foods in an effort to curb greenhouse gas emissions from animal agriculture. Novel solutions are needed for producing quality protein with minimal environmental and climate impacts. Perfect Day has developed a means of producing dairy protein—nutritionally and chemically the same as conventional bovine dairy protein—via the fermentation of bioengineered microflora. This is the same technology widely employed by the food industry to produce ingredients such as vitamins, amino acids, flavors, enzymes, and rennet for cheese making. The first non-animal whey protein looks and behaves similar to its bovine counterpart. Similar processes could be used to produce a variety of other common food ingredients and materials that are sourced from animals today. On a longer time scale, the same approach could be used to manufacture fully designed novel proteins that could be superior in nutrition and functionality than what nature has provided thus far.