ch12_0495556718_164050

ch12_0495556718_164050 - Chapter 12 Food Soil and Pest...

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Chapter 12 Food, Soil, and Pest Management Summary 1. Even though food production has leveled off in the last 25 years, the world still produces enough food to meet the basic nutritional needs of people. However, the food cannot be evenly distributed throughout the world, leading to malnutrition and starvation. Many of these deaths come from malnutrition, which leads to a lack of resistance to diseases. Modern agricultural techniques create significant environmental harm, but the green revolution is also responsible for large increases in agricultural productivity. 2. Three systems produce foods for human consumption. Croplands produce mostly grains, about 77% of the world’s food. Rangelands provide meat, about 16% of the world’s food. Ocean fisheries supply about 7% of the world’s food. 3. Soils are degraded and eroded by water, wind, and people. Soil erosion is primarily caused by flowing water and wind. Human activities, such as farming, logging, construction, off-road vehicles, etc., also disturb soil and hasten erosion. In much soil there is also salt buildup and waterlogging. Crops can be planted today with less soil disturbance through conservation-tillage, tillage, contour farming, and strip farming. Farmers may also use
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