Chirping crickets are sustainable, but not that protein-rich.
There's a lot of buzz around insect-based protein these days. You can find pasta sauces like One Hop in many gourmet grocery sources, substituting crickets or mealworm for beef to make bolognese. Paleo dieters are intrigued. Lucky Peach says even if people are squeamish about eating grilled crickets, insect protein can be added to other foods to fortify them. Even Nas is convinced.
Among the benefits: they're vastly more sustainable, generating down to a hundredth the carbon footprint. The one doubt is whether bugs actually have enough protein to sustain us.