Insects are an incredibly resource-efficient protein source, which provides a completely unique sustainability profile. To produce one kg of protein, greenhouse gas emissions are up to 30 times lower than beef. Also use of important resources such as water is lower, even lower than plant-based protein - compared to soy, 330 liters less water is needed for one kilogram of protein. Artificial pesticides are never used and thus do not enter nature. In addition, you don't have to grow any food for the insects - they make use of plant-based food waste that would otherwise go to waste!
Sources: LCA Protix, Parodi et al, House, Mazac, Carbon Cloud