Yes, eating meat affects the environment, but cows are not killing the climate

A) As the scale and impacts of climate change become increasingly alarming, meat is a popular target for action. Advocates for the protection of the natural environment from destruction or pollution urge the public to eat less meat. Some activists have even called for taxing meat to reduce consumption of it.

B) A key claim underlying these arguments holds that globally, meat production generates more greenhouse gases than the entire transportation sector. However, this claim is demonstrably wrong, as I will show. And its persistence has led to false assumptions about the linkage between meat and climate change.

C) My recent research focuses on ways in which animal agriculture affects air quality and climate change. In my view, there are many reasons for either choosing animal protein or opting for a vegetarian selection. However, abandoning meat and meat products is not the environmental panacea(万灵药) many would have us believe. And if taken to an extreme, it also could have harmful nutritional consequences.

D) A healthy portion of meat's negative reputation centers on the assertion that livestock is the largest source of greenhouse gases worldwide. For example, an analysis published in 2009 by the World Watch Institute based in Washington, D.C. asserted that 51 percent of global greenhouse gas emissions come from rearing and processing livestock. according to the U.S. Environmental Protection Agency, the largest sources of U.S. greenhouse gas emissions in 2016 were electricity production (28 percent of total emissions).transportation (28 percent) and industry (22 percent). All of agriculture accounted for a total of 9 percent, but all of animal agriculture contributes less than half of this amount, representing 3.9 percent of the total greenhouse emission in the U.S. That is very different from claiming that livestock represents as much as or more than transportation.

E) Why is there such a misconception? In 2006 the United Nations Food and Agriculture Organization(FAO) published a study titled "Livestock's Long Shadow," which received widespread international attention. It stated that livestock produced a staggering 18 percent of the world's greenhouse gas emissions. The agency drew a startling conclusion that livestock was doing more to harm the climate than all modes of transportation combined. This latter claim was wrong, and has since been corrected by Henning Stenfeld, the report's senior author.

F) The problem was that analysts from the FAO used a comprehensive life-cycle assessment to study the climate impact of livestock, but a different method when they analyzed transportation. For livestock, they considered every factor associated with producing meat. This included emissions from fertilizer production, converting land from forests to pastures, growing feed, and direct emissions from animals (manure as well as expelling of gas from the stomach) from birth to death.

G) However, when they looked at transportation's carbon footprint, they ignored impacts on the climate from manufacturing vehicle materials and parts, assembling vehicles and maintaining roads, bridges and airports. Instead, they only considered the exhaust smoke emitted by finished cars, trucks, trains and planes. As a result, the FAO's comparison of greenhouse gas emissions from livestock to those from transportation was greatly distorted.

H) I pointed out this flaw during a speech to fellow scientists in San Francisco on March 22, 2010, which led to a flood of media coverage. To its credit, the FAO immediately owned up to its error. Unfortunately, the agency's initial claim that livestock was responsible for the lion's share of world greenhouse gas emissions had already received wide coverage. To this day, we struggle to "unring" the bell. In its most recent assessment report, the FAO estimated that livestock produces 14.5 percent of global greenhouse gas emissions from human activities. There is no comparable full life-cycle assessment for transportation. However, as Stenfeld has pointed out, direct emissions from transportation versus livestock can be compared and amount to 14 versus 5 percent, respectively.

I) Many people continue to think that avoiding meat as infrequently as once a week will make a significant difference to the climate. But according to one recent study, even if Americans eliminated all animal protein from their diets, they would reduce U.S. greenhouse gas emissions by only 2.6 percent. According to our research at the university of California, Davis, if the practice of Meatless Monday were to be adopted by all Americans, we'd see a reduction of only 0.5 percent.

J) Moreover, technological, genetic and management changes that have taken place in U.S. agriculture over the past 70 years have made livestock production more efficient and less greenhouse gas-intensive. According to the FAO's statistical database, total direct greenhouse gas emissions from U.S. livestock have declined by 11.3 percent since 1961, while production of livestock meat has more than doubled.

K) demandfor meat is rising in developing and emerging economies,especiallyin the Middle East, North Africa and Southeast Asia. For example, raising livestock such as goats in Kenya is animportantsource of food andincomefor many small-scale farmers and herders. But meat consumption per person in these regions still lags that of developed countries. In 2015,averageannual meat consumption per person in developed countries was 92 kilograms, compared to 24 kilograms in the Middle East and North Africa and 18 kilograms in Southeast Asia. Still, given projectedpopulationgrowthin the developing world, there willcertainlybe anopportunityfor countries such as the United States tobring their sustainable livestock rearing practices to the table.

L) Removing animals from U.S. agriculture would lower national greenhouse gas emissions to a small degree, but it would also make it harder to meet people's nutritional requirements. Many critics of animal agriculture are quick to point out that if farmers raised only plants, they could produce more pounds of food and more calories per person. But humans also need many essential micro- and macro-nutrients for good health. It's hard to make a compelling argument that the United States has a calorie deficit, given its high national rates of adult and child obesity. Moreover, not all plant parts are edible or desirable. Raising livestock is a way to add nutritional and economic value to plant agriculture.

M) As one example, the energy in plants that livestock consume is most often contained in cellulose(纤维素),which is indigestible for humans and many other mammals. But cows, sheep and other ruminant(反刍的)animals can break cellulose down and release the solar energy contained in this vast resource. According to the FAO, as much as 70 percent of all agricultural land globally is range land that can only be utilized as grazing land for ruminant livestock.

N) The world population is currently projected to reach 9.8 billion by 2050. Feeding this many people will raise immense challenges. Meat is more calorie-dense per serving than vegetarian options, and ruminant animals largely thrive on feed that is not suitable for humans. Raising livestock also offers much-needed income for small-scale farmers in developing nations. Worldwide, livestock provides a livelihood for 1 billion people.

O) Climate change demands urgent attention, and the livestock industry has a large overall environmental footprint that affects air, water and land. These, combined with a rapidly rising world population, give us plenty of compelling reasons to continue to work for greater efficiencies in animal agriculture. I believe the place to start is with science-based facts.

36. The FAO concluded that farm animals were producing more greenhouse gases than all modes of transportation combined.

37. Consumption of meat per person in developing countries is much less than that in countries like the U.S.

38. The FAO was worthy of praise in that it admitted its mistake once it was pointed out.

39. Environmentalists try hard to make people consume less meat to combat climate change.

40. Recent research has shown that even if Americans quit eating meat altogether, the resulting reduction of greenhouse gases in the U.S. would be slight.

41. More than half of the world's farmland is suitable only for animals like cows to graze on.

42. The allegation that farm animals produce the world's largest portion of greenhouse gases is responsible for meat's bad reputation.

43. Raising farm animals makes it easier to meet people's nutritional needs.

44. The author doesn't believe giving up meat and meat products will be a cure-all for the environmental problem.

45. Changes in America's farming technology and management in the past decades have increased efficiency and reduced greenhouse gas emissions in meat production.

答案解析：

36. 由题干中的关键词 “FAO” 和 “more than transportation” 定位到E段。E段提到“The agency drew a startling conclusion that livestock was doing more to harm the climate than all modes of transportation combined.”，联合国粮农组织(FAO)这个机构得出了一个惊人的结论，即畜牧业对气候的危害比所有交通方式加起来还要大，所以选E。

37. 由题干中的关键词 “Consumption of meat per person” 和 “developing countries” 定位到K段。K段提到“In 2015, average annual meat consumption per person in developed countries was 92 kilograms, compared to 24 kilograms in the Middle East and North Africa and 18 kilograms in Southeast Asia.”，2015年，发达国家人均年肉类消费量为92公斤，而中东和北非为24公斤，东南亚为18公斤，说明发展中国家人均肉类消费量远低于美国等发达国家，所以选K。

38. 由题干中的关键词 “FAO” 和 “admitted its mistake” 定位到 H段。定位到H段。H段提到“To its credit, the FAO immediately owned up to its error.”，值得赞扬的是，联合国粮农组织(FAO)立即承认了错误，所以选H。

39. 由题干中的关键词 “Environmentalists” 和 “consume less meat” 定位到A段。A段提到“Advocates for the protection of the natural environment from destruction or pollution urge the public to eat less meat.”，保护自然环境免受破坏或污染的倡导者敦促公众少吃肉，这里的倡导者即环保主义者，所以选A。

40. 由题干中的关键词“Recent research”以及“even if Americans quit eating meat altogether, the resulting reduction of greenhouse gases in the U.S. would be slight”定位到I段。I段提到“But according to one recent study, even if Americans eliminated all animal protein from their diets, they would reduce U.S. greenhouse gas emissions by only 2.6 percent.”，但根据最近的一项研究，即使美国人从饮食中完全去除所有动物蛋白，美国的温室气体排放量也只能减少2.6%，说明即使美国人完全不吃肉，美国温室气体排放量的减少幅度也很小，所以选I。

41. 由题干中的关键词 “farmland” 和 “graze on” 定位到M段。M段提到“According to the FAO, as much as 70 percent of all agricultural land globally is range land that can only be utilized as grazing land for ruminant livestock.”，据联合国粮农组织(FAO)称，全球多达70%的农业用地是牧场，只能用作反刍牲畜的放牧地，说明世界上超过一半的农田只适合像牛这样的动物放牧，所以选M。

42. 由题干中的关键词 “bad reputation” 和 “largest portion of greenhouse gases” 定位到D段。D段提到“A healthy portion of meat's negative reputation centers on the assertion that livestock is the largest source of greenhouse gases worldwide.”，肉类名声不佳在很大程度上源于这样一种说法，即畜牧业是全球最大的温室气体来源，所以选D。

43. 由题干中的关键词 “nutritional needs”定位到L段。L段提到“Removing animals from U.S. agriculture would lower national greenhouse gas emissions to a small degree, but it would also make it harder to meet people's nutritional requirements.”，将动物从美国农业中移除会在一定程度上降低国家温室气体排放，但也会使满足人们的营养需求变得更加困难，反过来说明饲养农场动物有助于满足人们的营养需求，所以选L。

44. 由题干中的关键词 “cure-all” 和 “giving up meat” 定位到C段。C段提到“However, abandoning meat and meat products is not the environmental panacea(万灵药) many would have us believe.”，然而，放弃肉类和肉制品并不是许多人认为的解决环境问题的万灵药，所以选C。

45.由题干中的关键词 “farming technology and management” 和 “increased efficiency” 定位到J段。J段提到“Moreover, technological, genetic and management changes that have taken place in U.S. agriculture over the past 70 years have made livestock production more efficient and less greenhouse gas - intensive.”，此外，过去70年来美国农业在技术、遗传和管理方面发生的变化使畜牧业生产效率更高，温室气体排放强度更低，所以选J。