“Today, no one knows about it. But over the next 10 years, we’re going to see rubisco be one of the main proteins,” says Ross Milne, CEO of the New Zealand-based company Leaft, which makes the Leaft Blade, a liquid performance fuel shot made from rubisco that recently entered the U.S. market. Rubisco, which stands for ribulose-1,5-bisphosphate carboxylase/oxygenase, is found in every green leaf. It’s the heavy hitter responsible for photosynthesis. Scientists talk up its qualities: it has a complete amino acid profile and can be made into a white, neutral-tasting powder. It can be gelled, emulsified, and made into just about anything. It doesn’t seem to cause allergies in people, which can’t be said for dairy or soy. Rubisco is easy to digest, compared to most plant proteins. And it’s incredibly abundant.  “From a food-ingredient point of view, it’s one of the best natural proteins out there,” says Slavko Komarnytsky, a biologist at the Plants for Human Health Institute at NC State University.…