請依下文回答第 47 題至第 50 題
More people than ever are thinking about ways to cut down on greenhouse gas emissions. Some scientists suggest
that 47 on our meat diets would help. The raising of livestock like pigs and cows occupies two-thirds of the world’s
farmland and causes 20 percent of greenhouse gases according to some estimates. It 48 that the key to saving our
planet may not be just reducing our intake of meat; instead, switching our diet to insects may be the answer. In fact, the
United Nations (UN) wants to search for alternatives 49 the meat in our diet. The UN Food and Agriculture
Organization (FAO) 50 a policy paper on the eating of insects. They already held a meeting on the topic in
Thailand in 2008, and a world congress meeting is in the plans for 2013.