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英検1級要約環境

都市が発展するにつれて、自然の地面は道路、駐車場、歩道、建物などに次第に覆われていきます。

As cities grow, natural ground is increasingly covered by roads, parking areas, sidewalks, and buildings. Unlike soil and vegetation, these surfaces prevent much of the rainwater from soaking into the ground. Instead, water flows rapidly across streets and into drainage networks. Many of these systems were built decades ago, when urban populations were smaller and severe storms were less common. As a result, they may struggle to handle the large volumes of runoff produced during periods of intense rainfall.

90〜110語 · プリントあり

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英検1級要約環境

よりクリーンなエネルギーへの移行によって、電気自動車、バッテリー、再生可能エネルギー設備に使われる鉱物の需要が増加しています。

The transition to cleaner energy has increased demand for minerals used in electric vehicles, batteries, and renewable-energy equipment. Metals such as nickel and cobalt are important for many of these technologies, but much of the world's supply currently comes from mines on land. As demand rises, companies and governments are looking for additional sources. One possibility is the deep ocean floor, where mineral-rich rocks have formed over extremely long periods. Supporters of deep-sea mining argue that extracting these deposits could reduce pressure on terrestrial mines and help secure supplies of materials needed for new energy technologies.

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英検1級要約環境

温室効果ガスの排出量を減らそうとする各国政府は、再生可能エネルギーの利用や、より効率的な生産方法を推進してきました。

Governments seeking to reduce greenhouse-gas emissions have encouraged the use of renewable energy and more efficient production methods. However, some industries are difficult to decarbonize completely. Steel and cement production, for example, can release large amounts of carbon dioxide not only from the energy they consume but also from chemical reactions that are central to manufacturing. As a result, even factories that replace fossil-fuel electricity with cleaner sources may continue producing substantial emissions. This is a particular concern because such materials are widely used in buildings, roads, machinery, and other parts of modern economies.

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英検1級要約環境

世界の多くの地域では、人口増加や繰り返される干ばつによって、淡水資源への圧力が高まっています。

In many parts of the world, growing populations and repeated droughts are putting increasing pressure on freshwater supplies. Rivers, lakes, and underground sources have traditionally provided most of the water used by households, farms, and businesses. In some regions, however, these sources can no longer meet demand throughout the year. As supplies become less reliable, competition for limited water intensifies among different users. During prolonged dry periods, authorities may have to decide whether scarce resources should be directed toward homes, agriculture, or industry, making water management an increasingly difficult issue for governments and local communities alike.

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英検1級要約環境

気候変動と人口増加によって、農家はますます厳しい環境の中で、より多くの食料を生産することを求められています。

Climate change and population growth are increasing pressure on farmers to produce more food under increasingly difficult conditions. Droughts are becoming more frequent in some regions, while plant diseases can spread rapidly and damage large areas of crops. Farmers therefore need varieties that can continue producing high yields despite such stresses. Traditional breeding has long been used to improve useful characteristics, but developing new varieties in this way can take many years. As environmental conditions change quickly, conventional methods may not always produce suitable crops fast enough to meet new agricultural challenges.

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英検1級要約環境

PFASは、防水性のある素材、工業用コーティング、消火用泡剤などの製品に数十年にわたって使用されてきた、多数の化学物質の総称です。

PFAS are a large group of chemicals that have been used for decades in products such as water-resistant materials, industrial coatings, and firefighting foams. Because these substances break down very slowly, they can remain in the environment for long periods after their release. In some areas, PFAS from factories, military bases, and training facilities have seeped into nearby soil, groundwater, and rivers. Once these chemicals enter water systems, they can spread beyond the original source and contaminate supplies used for drinking. This means communities may continue to face pollution even after the activities that caused it have ended.

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英検1級要約環境

かつて、多くのダムが洪水を防ぎ、発電を行い、地域の水供給を支えるために河川に建設されました。

Many dams were built on rivers in the past to control floods, generate electricity, and support local water supplies. As these structures age, however, the cost of inspecting, repairing, and maintaining them can rise significantly. Some older dams no longer provide the same economic benefits they once did, especially when their power output or other uses have declined. At the same time, dams can block fish from reaching spawning areas and interrupt the natural movement of sediment downstream, gradually changing the physical and ecological character of rivers.

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英検1級要約環境

大型貨物船は、航海中に船体を安定させるため追加の重量が必要な場合、専用のタンクに海水を取り込むことがあります。

Large cargo ships often take seawater into special tanks when they need additional weight to remain stable during a voyage. This ballast water is usually collected near the port of departure and released when cargo is loaded or when the vessel reaches another destination. Along with the water, however, ships can unintentionally take in tiny marine organisms, including larvae and plankton. When the water is discharged in a distant region, some of these organisms may survive and establish populations in an environment where they did not previously exist. Growing international shipping has therefore increased opportunities for species to cross natural geographic barriers.

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英検1級要約環境

一部の国では、既存の原子力発電所を当初予定されていた期間を超えて運転し続けることが検討されています。

Some countries are considering keeping existing nuclear power plants in operation beyond the periods originally planned. One reason is the need to meet electricity demand without increasing greenhouse-gas emissions from fossil fuels. Extending the life of current plants can also avoid the time and expense required to build replacement generating capacity. However, reactors, pipes, and other components are exposed to heat, radiation, and pressure for many years. As these materials age, deterioration can become more important, making regular inspections and the replacement of worn equipment essential for maintaining safe operation.

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英検1級要約環境

泥炭地は、水分を多く含む土地で、完全には分解されていない植物由来の物質が長い年月をかけて蓄積した場所です。

Peatlands are naturally water-rich areas where partially decomposed plant material has accumulated over long periods. In some regions, however, these lands have been drained so that they can be used for farming or grazing. Removing water makes the ground easier to cultivate, but it also exposes peat to air. Once dried, the organic material begins to break down more rapidly and releases carbon that had been stored in the soil. Continued drainage can also cause the land surface to sink and make dry peat more vulnerable to fire, creating problems that may become more severe over time.

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英検1級要約環境

リンは作物の生産に欠かせない栄養素であり、現代の農業は、限られた地域で採掘されるリン鉱石に大きく依存しています。

Phosphorus is an essential nutrient for crop production, and modern agriculture depends heavily on phosphate rock mined from a limited number of regions. Farmers use phosphorus fertilizers to maintain soil fertility and achieve high yields, but this dependence creates a vulnerability in the global food system. If demand rises sharply or mining and transport are disrupted in major producing areas, the price and availability of phosphate rock can become unstable. Countries that import most of their fertilizer materials may be especially exposed because they have few alternative sources when international supplies tighten.

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英検1級要約環境

航空機が高高度を飛行すると、適切な大気条件のもとでは、排気に含まれる水蒸気が凍結し、長時間残る飛行機雲が発生することがあります。

Aircraft flying at high altitudes can sometimes produce long-lasting condensation trails when water vapor in their exhaust freezes under suitable atmospheric conditions. These trails, known as contrails, may spread and persist for hours instead of disappearing quickly. Although they look like thin clouds, their climate effect can be significant because they can reduce the amount of heat escaping from Earth's atmosphere. As a result, aviation can contribute to warming not only through carbon dioxide emissions but also through these non-CO2 effects, which may increase the sector's overall influence on the climate and complicate efforts to measure and reduce aviation-related warming.

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英検1級要約環境

国際貿易の急速な拡大に伴い、世界の海を航行する大型船の数が増えています。

International trade has expanded rapidly, leading to more large ships traveling across the world's oceans. These vessels generate continuous low-frequency noise from engines, propellers, and other machinery, and the sound can travel long distances underwater. For many marine animals, especially whales and other species that depend heavily on sound, this creates a growing problem. They use acoustic signals to communicate, navigate, locate food, and maintain contact with others. When human-made noise becomes intense or persistent, these important signals may be masked, making it harder for animals to detect information they rely on. In heavily traveled waters, repeated exposure can leave few quiet periods for normal behavior.

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英検1級要約環境

窒素肥料は、作物の成長を助け、収穫量を増やすことができるため、農地で広く使用されています。

Nitrogen fertilizers are widely used on farmland because they help crops grow and can increase yields. However, plants do not absorb all of the nutrients that farmers apply. When more nitrogen is added than crops can use, some of it remains in the soil and can be carried away by rain. Water moving across fields or through the ground may then transport this excess nitrogen into rivers, lakes, and coastal waters. As a result, areas far from the original farmland can receive unusually high levels of nutrients, especially after heavy rainfall or during seasons when fields are left bare.

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英検1級要約環境

果物、苗木、木材など、大量の植物由来製品が毎日国境を越えて取引されています。

Large quantities of plant-based products, including fruit, young plants, and timber, are traded across national borders every day. This commerce supports agriculture and construction, but it can also move unwanted organisms from one region to another. Insects, eggs, fungi, or other pathogens may remain hidden on plants, packaging, or wood during transport. If they survive the journey and enter a place where they were previously absent, they may establish new populations. Because international trade connects distant ecosystems more quickly than natural movement would, even a small number of contaminated shipments can create opportunities for agricultural pests to spread.

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英検1級要約環境

石油や天然ガスの井戸は、生産が終了した後にそのまま放置されることがあります。

Oil and natural-gas wells are sometimes left behind after production ends, especially when operators close businesses or abandon sites without completing proper sealing work. Thousands of these old wells exist in some producing regions, and their condition can deteriorate over time. Casings, valves, and other equipment may corrode, while gaps can develop around the well structure. When this happens, gases trapped underground, including methane, can move upward and escape at the surface. Because many abandoned wells are no longer regularly inspected, leaks may continue for long periods before anyone notices them.

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英検1級要約環境

山火事が長年にわたって積極的に抑えられてきた地域では、森林に乾燥した落ち葉、枯れ枝、その他の燃えやすい物質が徐々に大量に蓄積することがあります。

In regions where wildfires have been aggressively suppressed for many years, forests can gradually accumulate large amounts of dry leaves, dead branches, and other flammable material. Preventing small fires may protect communities in the short term, but it also allows this fuel to build up on the forest floor. During prolonged dry periods, a single ignition can then spread quickly through the abundant vegetation. Strong winds and low humidity can make the situation worse, turning what might once have been a limited fire into a much larger and more intense wildfire that is difficult to control.

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英検1級要約環境

寒冷地域では、冬の間、道路の凍結を防ぎ交通事故を減らすために、塩化物を主成分とする融雪剤が大量に散布されます。

In cold regions, large quantities of chloride-based deicing salts are spread on roads during winter to prevent ice from forming and reduce traffic accidents. These materials are effective and relatively inexpensive, which makes them widely used by local authorities. However, the salt does not remain on the road. When snow melts or rain falls, dissolved chloride can be washed into nearby streams, lakes, and groundwater. Because chloride breaks down very slowly, repeated winter applications can cause concentrations to build up over many years, especially in areas with heavy road traffic and limited water circulation. Pollution can therefore continue even outside the winter season.

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英検1級要約環境

地熱発電は、地下に蓄えられた熱を利用して電気を生み出すもので、天候に左右されずに稼働できる低炭素エネルギー源として注目されています。

Geothermal power uses heat stored beneath the ground to generate electricity and has attracted attention as a low-carbon source that can operate regardless of weather conditions. In some projects, however, operators inject water deep underground or pump hot fluids back to the surface. These activities can change pressure within rock formations and nearby faults. In certain regions, the resulting stress changes have triggered earthquakes that would otherwise have been unlikely to occur at that time or place. Most such events are small, but the possibility of stronger shaking has raised concerns around some geothermal developments.

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英検1級要約環境

乾燥地域では、作物を安定して生産するのに十分な降雨がないため、農家は灌漑に頼ることがよくあります。

In dry regions, farmers often depend on irrigation because rainfall is too limited to support reliable crop production. Irrigation water naturally contains small amounts of dissolved salts, and repeated use can gradually change the condition of the soil. When water applied to fields evaporates or is taken up by plants, much of the salt remains behind. If this process continues for many years, salt concentrations can rise to levels that damage crops. The problem is especially serious where drainage is poor, since salts cannot easily move away from the root zone.

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英検1級要約環境

大規模な商業漁業では、魚介類を効率よく大量に捕獲するために、網、釣り糸、その他の漁具が使用されます。

Large-scale commercial fishing uses nets, lines, and other gear designed to catch large quantities of seafood efficiently. These methods help supply global markets, but they do not always capture only the intended species. Seabirds, sea turtles, marine mammals, and non-target fish can become trapped or hooked accidentally while vessels pursue commercially valuable catches. Some of these animals are released alive, but many are injured or die before they can escape. Because bycatch occurs during normal fishing operations, large numbers of unintended animals may be affected even when fishers are following legal practices.

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英検1級要約環境

漁網、わな、その他の漁具は、嵐、事故、設備の故障などによって海で失われることがあります。

Fishing nets, traps, and other gear are sometimes lost at sea because of storms, accidents, or equipment failure. Once separated from their owners, these items may continue functioning for months or even years. Fish, seabirds, turtles, and other marine animals can become trapped in abandoned gear even though no fisher is present to collect the catch. Because the equipment is no longer being monitored, animals that are caught may die and remain inside, attracting additional creatures and allowing the cycle to continue. This unintended capture is commonly known as ghost fishing.

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英検1級要約環境

魚介類への需要の高まりを背景に、沿岸海域や河川では大規模な魚類養殖が拡大しています。

Growing demand for seafood has encouraged the expansion of large-scale fish farming in coastal waters and rivers. Aquaculture can provide a stable supply of fish without relying entirely on wild stocks, but farms must keep large numbers of animals within cages, ponds, or other enclosed facilities. Storms, floods, or structural failures can damage these systems and allow farmed fish to escape into surrounding waters. Once outside, they may spread over wide areas and come into contact with wild populations that evolved under local environmental conditions.

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英検1級要約環境

人工照明は、安全や経済活動を支えるため、都市、道路沿い、商業地域などで夜間に広く使用されています。

Artificial lighting is widely used at night in cities, along roads, and around commercial areas to support safety and economic activity. Streetlights, illuminated signs, and building lights can help people travel and work after dark, but much of this light is stronger than necessary or directed where it is not needed. Light that shines upward or spreads beyond its intended area can brighten the night sky over a wide region. As urban areas expand, places that once experienced natural darkness may remain illuminated throughout the night, changing environmental conditions that many species have depended on for generations.

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