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全文字数：1450字

阅读时间：15分钟

上期划线句答案

Ten of the 11 most polluted countiesarein California （where the climate breakdown is fueling wildfires and rising temperatures that are undermining efforts to improve air quality in places like Fresno, San Bernardino, Tulare and Los Angeles.）

在11个污染最严重的县中，有10个都在加州，那里的气候变化加剧了野火和气温上升，破坏了弗雷斯诺、圣伯纳迪诺、图雷和洛杉矶等地空气质量改善的进程。

本期内容

双语阅读

The vastswathesofkelpforest growing along the world’s coastlines are estimated to generate $500 billion a year on average, making them considerably more valuable than previous studies have suggested, according to an analysis that assessed economic contributions made by six types of the seaweed.

翻译划线句，长按文末小程序码打卡，答案下期公布~

The study, published on 18 April in Nature Communications, estimates that kelp forests provide services worth between $465 billion and $562 billion a year worldwide, mainly by providing a habitat for valuable fish and seafood species, and by removing nitrogen from contaminated seawater. The results suggest that each type of kelp forest generates up to $147,100 per hectare annually, a figure that’s more than three times higher than previous estimates.

4月18日发表在《自然通讯》上的这项研究估计，全球海带林每年提供的作用价值在4650亿至5620亿美元之间，海带林的主要作用是为珍贵鱼类和海产物种提供栖息地，以及去除污染海体中的氮。结果表明，每种类型的海带林每年每公顷可产生高达147,100美元的收入，这一数字比之前的估计高出三倍多。

Kelp forests are widespread in temperate and polar regions, with some 740 million people thought to live within 50 kilometres of one of these tracts of brown seaweed. They provide habitat for more than 1,000 species, draw carbon dioxide from the atmosphere and help to remove nutrient pollution, such as nitrogen and phosphorus, from the ocean.

海带林广泛分布在温带和极地地区，人们认为约有7.4亿人生活在褐藻生长地带周边50公里范围之内。这类植物为1000多个物种提供栖息地，从大气中吸收二氧化碳，并帮助清除海洋中的营养污染，如氮和磷。

Despite this, few studies have attempted to quantify the economic value of kelp forests on a global scale. To address this gap, Eger and his colleagues assessed the value of common types of kelp forest by considering their contributions to fisheries, nutrient cycling and atmospheric CO2 removal. Theycollatedkelp-distribution estimates, data from biodiversity surveys and current seafood prices from different regions.

除此之外，很少有研究试图对全球内的海带林的经济价值进行量化研究。为了填补这一空缺，艾格和他的同事们通过考虑它们对渔业、营养循环和大气中的二氧化碳去除方面的贡献，评估了几种常见类型的海带林的价值。他们核对了海带分布情况的大致信息、来自于生物多样性调查的数据和不同地区目前的海鲜价格。

Each hectare of kelp forest also removes an average of 657 kilograms of excess nitrogen — which flows into the ocean in waste water and agricultural runoff — from seawater, a service worth almost $74,000 per hectare per year. And together, kelp forests absorb almost five megatonnes of atmospheric CO2 each year, putting them on a par with other prominentcarbon sinks, such asmangroveforests andterrestrialwoodland.

吸每公顷海带林平均还能去除海水中657公斤多余的氮，这些氮通过废水和农业径流的形式流入海洋，海带林的这项功能每年每公顷的价值将近7.4万美元。海带林每年吸收大气中近500万吨的二氧化碳，与其他主要的碳汇(如红树林和陆地林地)的吸碳能力相当。

本文节选自：Nature（自然）

发布时间：2023.04.18

作者：Gemma Conroy

原文标题：Why Earth’s giant kelp forests are worth $500 billion a year

词汇积累

1. swathe

/sweɪð/

n.（割了庄稼的）一长条田地；一长条；绷带，包装物

v.包，裹；紧绑

2. kelp

/kɛlp/

n.[植]巨藻，海藻；海草灰

vi.烧制海草灰

3. collate

/kɒˈleɪt/

vt.核对，校对；校勘

4. mangrove

/ˈmæŋɡrəʊv/

n.红树林

5.terrestrial

/təˈrɛstrɪəl/

adj. 地球的，地球上的; 陆栖的，陆生的; 陆地(上)的; 陆地上的，地面上的(与卫星相对而言)

n. 地球生物，陆地生物

词组搭配

1.carbon sinks 碳汇（指通过吸收和储存二氧化碳等温室气体来减少大气中温室气体浓度的过程。）

写作句总结

原句：To address this gap, Eger and his colleagues assessed the value of common types of kelp forest by considering their contributions to fisheries

结构：To address this gap, sb did sth1 by doing sth2

为了缩短这一差距，某人做了某事。

例句：To address this gap in access to healthcare, the government launched a program to subsidize medical costs for low-income families by increasing funding to public hospitals.

阅读理解题

What is the main purpose of the study mentioned in the article?

A. To discover new species of kelp forests.
B. To determine the average price of seafood from kelp forests.
C. To assess the economic contribution of kelp forests on a global scale.
D. To find ways to cultivate kelp forests for commercial purposes.

C

打卡作业

在草稿纸上翻译文章中的划线句，完成每日的打卡练习！下期推送会公布参考翻译答案，大家一起来学习英语吧~

外刊君为同学们汇总了《经济学人》，戳码回复“J88”，下载pdf源文件。

（戳码回复“J88”）

• END •

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