摘要：今天要跟大家分享的雅思閱讀素材題目是“Plastic bag ban is no sure bet for the environment"禁止使用塑料袋不一定有利于環保。環保類話題也是雅思考試的常客，這篇文章非常值得一讀哦~

這篇雅思閱讀素材是要跟大家分享關于“環保類”的話題。禁止使用一次性購物塑料袋(single-use plastic-shopping bag ban)本意是提升環境質量，減少垃圾，改善城市景觀。然而，此令一出，城市垃圾場中可多次使用的塑料袋(reusable plastic bag)激增，給垃圾處理帶來了更大的問題。看來，環保還真是個系統工程，好心(good intentions)不一定得好報。

When the city council in Austin, Texas,passed a single-use plastic-shopping-bag(一次性塑料購物袋) ban in 2013, it assumed environmental benefits would follow. The calculation was reasonable enough(這算盤打得相當合理):Fewer single-use bags in circulation(流通) would meanless waste at city landfills(垃圾堆，垃圾場).

Two years later, an assessment(評估)commissioned by the city finds that the ban is having an unintended effect: People are now throwing away heavy-duty(耐用的) reusable plastic bags at an unprecedented(前所未有的)rate. Thecity’s good intentions have proven all too vulnerable(易受攻擊的，易受傷害的) to the laws of supply and demand.(該城市的良好愿望在供求法則面前完全不堪一擊。)

What’s true for Austin is likely true elsewhere. Plastic-bagbans are one of America’s most popular environmental measures of recent years:Since San Francisco became the first U.S. city to implement(實施)a ban in 2007, more than 100 other U.S.cities, including Chicago,have joined the cause. While it’s been relatively easy to rally(召集，聚集)consensus(一致意見)around these bans, however, it’s been far harder to achieve significant results. (雖然圍繞這些禁令相當容易就達成了一致意見，但要取得實質性效果卻難多了。)

Part of the problem is that — despite the world-saving rhetoric(說辭，說法) that typically promotes and supports plastic-bag bans — plastic bags simply aren’t that big of a problem. (盡管推廣和支持塑料袋禁令時都在說什么拯救世界云云，但塑料袋根本就不是一個什么大問題。)According to the national data recorded by the Environmental Protection Agency in 2013, the weight of single-use plastic shopping bags amounted to around 0.28 percent of the total municipal(市政的)solid waste that Americans generate(生產，制造). A more finely tuned litter survey in Fort Worth, Texas (reported in the Austin assessment), found that just 0.12 percent of the weight of litter in the city (which does not have a ban) comes from single-use bags.

Nonetheless, as proponents(支持者) of bag bans rightly point out, weight isn’t the only measure of environmental impact. Single-use plastic bags pose outsized(大號的，特別大的) problems in the form of visual pollution on the landscape(景觀) — South Africans joke that plastic bags are their“national flower,” due to their propensity(傾向)to hang on branches — and damage and delays at high-tech recycling centers. (Reusable bags usually aren’t eligible for(合適的，有資格的) recycling, but when they end up at centers by mistake, they often wrap around and jam moving equipment.) Single-use bagscan also pose health hazards(危害) to wildlife and livestock(牲畜);during a recent trip to Dubai, United Arab Emirates, I heard a plastic recycler lament(哀嘆，抱怨) that ranched(在牧場飼養的) camels frequently die from ingesting theplastic bags that are constantly catching flight in the desert wind — and even when they do wind up at landfills, they take centuries to decompose(分解，腐爛).

There’s little doubt that targeted bans can mitigate(中和，減輕) these kinds of effects by cutting down onthe use of reusable bags(唐老雅感覺此處疑為single-use bags 之誤!) in the first place. In Austin, for example, a post-ban survey found that single-use plastic bags accounted for only 0.03 percent of the total litter collected in the city in 2015. Assuming(如果，假定)the pre-ban rate was closer to the 0.12 percent in nearby Fort Worth, that marks a roughly 75 percent reduction of single-use plastic bags in Austin’s landfills.

But, as the Austin assessment pointedly notes, reducing the use of a product that’s harmful to the environment is no guarantee of a positive environmental outcome.(…… 減少使用某種對環境有害的產品不能確保給環境帶來積極的結果)Among the main environmental benefits of Austin’s ban was supposed to be a reduction in the amount of energy and raw materials used to manufacture the bags. To that end(為此，為了那個目的), the city encouraged residents to instead use reusable bags. Those bags have larger carbon footprints, due to the greater energy required to produce their stronger plastics, but the city figured the overall impact would be lower, as consumers got acquainted with(熟悉，了解) the new, more durable product.

What the city didn’t foresee is that residents would start treating reusable bags like single-use bags. The volume of reusable plastic bags now turning up at the city’s recycling centers has become “nearly equivalent to(等于，相當于)the amount of all of the single-use bags removed from the recycling stream as a result of the ordinance(法令) implemented in2013,” according to the assessment. And those lightly used bags are landfill-bound(去往垃圾場), because recycling isn’t any more cost-effective for reusable plastic bags than for the single-use variety.

Some of these issues could be addressed(解決)through the increased use of reusable canvas bags. But canvas is even more carbon intensive to produce than plastic; studies suggest consumers would need to use a single canvas bag around 130 times before they start achieving any net environmental benefit as compared with a single-use plastic bag. (研究表明，與一次性塑料袋相比，消費者要使用一個帆布袋達130次左右才開始產生環保凈效用。) And, for some consumers, the higher price for canvas bags may be prohibitive(價格過高的;禁止的), in any case.

               
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