As you know, sustainability involves attempting to manager our waste as a resource. Much of accomplishing this will involve thinking of our resources and thier journey through their uses. Recycling and creating resource use plans that utilize resources to maximize their potential usefulness can help us to achieve this. Grass leaf protein sounds like an interesting leap into this paradigm of thought. It doesn't sound like its is a technology that is near a efficiency. It sounds like it's worth a read and perhaps some contemplation.