Today, insect eating is on the rise. Did our ancestors chow down on the critters, too? (Credit: CK Bangkok Photography/Shutterstock)

Anticipating food shortages in coming decades, some companies are touting insects as tomorrow’s protein source. Entrepreneurs are jumping on board and chips made of crickets are hitting grocery shelves. But scientists advise caution: They say more research is needed on the environmental impact of rearing insects at an industrial scale.

As sustainability exp