To overcome rubisco's lassitude and maladroitness, plants make a lot of it. As much as half of the protein in many plant leaves, by weight, is rubisco--it is often said to be the world's most abundant protein. One estimate is that plants and microorganisms contain more than eleven pounds of rubisco for every person on Earth. The biological chain seems clear: more nitrogen = more rubisco = more photosynthesis = more plant growth = more food from farms.