Since when do we have an obligation to feed the rest of the world?
If we were all "clean-platers" the world hunger problem would be solved.
We don’t have such an obligation. However, if we burn a good portion of the food supply and prices go up significantly, people starve, and on a global scale we’re talking millions of people. While we have no explicit obligation to them, a sense of decency demands that we not take actions we know will kill others where our own survival is not at stake.