It's not everyday that you hear an idea that could literally change the world. I vaguely heard about this a few years ago, but for what ever reason didn't look into it more. I saw it again on the Colbert Report a few weeks ago, and it renewed my interest. Here are two similar but different approaches to growing crops. Both of them are more efficient, healthier, and bound to help feed the masses. Now to educate the masses to stop reproducing like rabits! Science can only save us so much.
I think this one is the best idea, but may take awhile until it's actually in place.
This one is pretty cool too. Maybe the above one would be combined with this.