Tangent. If I was a mad genetic scientist with no ethics, there are a few things I'd do -- engineering a virus to deliver a few "software patches" to our DNA. One of those things would be to engineer the production of cellulase as an enzyme in our digestive system -- so we can get energy from grass and such in an emergency. Probably the Law of Unintended Consequences will make this worse for humanity somehow (Begun the Grass Wars have!). Mosquitos also get blood sucking removed, in an attempt to make them purely pollinating insects. Vote for Troy as mad scientist!
Won't help the hungry in Sudan now, though. So I'm open to better ideas. Sadly, I largely have bad ideas. If I'm on the side of full external military intervention, it would be considered "colonial". It's hard to propose any solution that isn't just "send aid" -- and you don't want to do that because it gets seized by the parties involved to support their conflict. Do we just watch it play out and accept refugees? That's lame -- how many millions will die in each of the above scenarios. Fuck.
Not sure if you're interested, but John Wyndham Christopher wrote a book about how all grass in the world dies out (including grasses like wheat) and how it destroys civilization.
I think it is more complicated than lacking an enzyme. Correct me if I am wrong but doesn't pretty much everything that eats grass need to do tricks like eating feces, or having multiple stomachs, or chewing cud, or eating gravel to get nourishment out of it?
Well, yeah, bit it would still likely help gain some nutrition from something that would otherwise pass clean through you. Our poops would look more like horse turds than cow pies. Just dense barely digested grass.