Quick Answer. Neo-Malthusian theory holds that population growth is exponential and that human population growth can easily outstrip its food resources if not held in check with artificial birth control measures. It differs from traditional Malthusian theory in the proposed birth control solution.
Terrace farming is when farming is done on manmade terraces that have been built into slopes. When humans transform a slope into a series of flat surfaces, they form terraces. Crops are then grown on these flat surfaces rather than on the slope, preventing crops from sliding down the slope over time. The image below is of rice paddies grown on terraces. By building these terraces, water flows down and accumulates in each terrace. If the terraces did not exist, rainfall and water would flow from higher elevations down the hill/mountain, carrying important soil and nutrients with it. Building terraces prevents this from happening.
It appears that dry farming has been around for a very long time, and might be spreading to other parts of the country. What Is Dry Farming? Dry farming tomatoes is a very simple process where you plant and water your tomatoes just as you normally would until the plant begins setting fruit. Once the fruit appears on the tomato plant, you cease to water it. Basically, dry farming is growing crops without any irrigation to supplement rainfall. This does not mean your tomatoes will not be watered, just that you are not irrigating them yourself with drip irrigation or other watering methods. The plants are water only by rainfall only.