So what exactly is all this sustainability stuff about? Why does it matter?
If either of those questions have ever entered your mind, here's an over-simplified answer: Sustainable (or alternative) farming practices exist to ensure that we are producing food in such a way that won't hinder our ability to do so in the future. Or, you could say, a way that will allow sustained production while avoiding harm to the environment.
A more thorough and accurate definition can be found through the National Sustainable Agriculture Information Service (ATTRA), as well as the USDA's Alternative Farming Systems Information Center.
You see, agriculture and the environment are close friends — wouldn't it be nice if the humans responsible for managing the two could get along? Sustainable farming represents a bridge for the divide.