For those of you who don't know, cellulose is a complex sugar made by plant cells. It occurs in high amounts in celery and grass. Basically, if we could digest this, it would open up a new food source to humans. Unfortunately, we don't possess the enzyme to break down cellulose.
This shouldn't stop us however. We've already genetically engineered bacteria to produce insulin for us. Why not genetically engineer humans? (obviously, with a variety of tests to ensure its safety.)
Scientists should develop a way for humans to digest cellulose.
"We're all in the gutter, but some of us are looking at the stars."