Agriculture experts have a message for farmers worldwide: Take care of your soil, and your soil will take care of you. By using the techniques of “conservation agriculture”, they say farmers can save their land and save money, at the same time. This is becoming more important as the world’s population grows. More people means more food needs to be grown to feed them. Most modern agriculture looks like long rows of green crops covering large areas of land. They have neat rows of single kinds of plants with uncovered soil in between. Trey Hill’s farm in the U.S. state of Maryland does not look anything like that. Instead, there are green plants mixed in with what is left from other plants. Together they cover the soil. If you don't like your fields to look like a mess -- it has to kind-of grow on you. Yet, I have a lot of other owners and peers that are, like, 'Wow, what you're doing is really exciting.' So, what is farmer Hill doing that is different? He is going against farming practices that are thousands of years old.