Swapping cows for crickets would be a boon for the planet. But can environmentalists convince consumers to embrace insects as food? Between global warming’s rising tides and scorching droughts, industrial pollution, and a population predicted to reach 9 billion within the next few decades, keeping all of us fed poses a challenge. Scientists agree that the developed world’s current diet is unsustainable: our love of meat, in particular, simply requires too much land, grain, and…