The North-East of Brazil is the most densely populated semi-arid region in the world. Low, erratic rainfall and cyclic droughts make farming difficult. For generations, farmers have resorted to excessive use of chemicals and slash and burn agriculture, stripping the soil of nutrients. Now farmers like Irupuan Gomes are trying something new. He is using bush management techniques to rehabilitate the natural ecosystem. Not only is the environment healthier -- but so are his profits.