生命周期评估（LCA）是怎么比较“纸袋还是塑料袋更环保”这类问题的？
How does life cycle assessment (LCA) answer questions like whether paper or plastic bags are greener?
LCA把产品的原料开采、制造、运输、使用和处置全环节的能耗与排放都纳入核算，再按功能单位（如装5公斤物品一次）对比。纸袋可再生但生产和运输耗水耗能，塑料袋轻便但难降解，谁更环保取决于回收率、重复使用次数等前提。LCA的价值正在于避免凭感觉下结论，用数据回答环境问题。
LCA counts every stage — raw-material extraction, production, transport, use and disposal — then compares options per functional unit, such as carrying 5 kg of goods once. Paper bags are renewable but energy- and water-hungry to make; plastic bags are light but persist in the environment. Which is greener depends on recycling rates and how often each is reused — precisely why LCA insists on data over intuition.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#生命周期评估 #LCA #生态比较
如何计算一个产品的回收含量？
How is the recycled content of a product calculated?
回收含量指产品中来自消费后或工业后回收料的质量占比，通常按质量分数计算并需第三方认证追溯。计算要区分消费前废料和消费后废料，后者环境价值更高。可靠的核算依赖供应链的质量平衡法和票据追踪。
Recycled content is the mass share of a product coming from post-consumer or post-industrial recyclate, usually expressed as a mass fraction with third-party certification. It distinguishes pre-consumer scrap from post-consumer material, the latter being more valuable environmentally. Reliable accounting relies on mass-balance methods and document tracking across the supply chain.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#回收含量 #质量平衡 #认证
为什么锂、钴、稀土等关键矿产的回收既重要又困难？
Why is recycling critical minerals such as lithium, cobalt, and rare earths both important and difficult?
能源转型依赖锂、钴、稀土等关键矿产来制造电池和电机。然而这些矿产的开采集中在少数国家，且环境代价高昂。回收利用能提供城市矿山，显著降低供应链风险。难点在于电子废弃物中这些金属含量低而分散，加上电池和磁铁设计各异、拆解成本高；为此，欧盟《电池法规》已规定再生金属的最低含量和回收目标，推动矿产循环走向制度化。
The energy transition depends on critical minerals such as lithium, cobalt, and rare earths to make batteries and motors. Yet mining is concentrated in a few countries and carries high environmental costs. Recycling offers an urban mine that significantly lowers supply-chain risk. The difficulty is that these metals occur in low, dispersed concentrations in e-waste, and varied battery and magnet designs make dismantling costly; the EU Battery Regulation therefore sets recycled-content minimums and collection targets, institutionalising a circular economy for minerals.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#关键矿产 #城市矿山 #欧盟电池法规
微塑料为什么会出现在偏远山区和自然保护区的降水中？
Why do microplastics show up in precipitation over remote mountains and protected areas?
轮胎磨损、纺织纤维、道路灰尘与农膜碎片产生的微米级颗粒质量极轻，可被风从城市和农田扬起进入自由大气，随高空气流输送数百至数千公里，再通过降雨或干沉降落地。比利牛斯山高海拔观测站记录到每平方米每天数百个微塑料颗粒沉降，美国西部保护区的调查估算年沉降量超过千吨。这说明微塑料已进入全球性的大气循环，而不只是水体问题。
Micrometre-scale particles from tyre wear, textile fibres, road dust, and fragmented agricultural film are light enough to be lifted from cities and farmland into the free atmosphere, carried hundreds to thousands of kilometres by upper-level winds, and delivered back by rain or dry deposition. A high-altitude station in the Pyrenees recorded hundreds of microplastic particles deposited per square metre per day, and surveys of protected lands in the western United States estimated more than a thousand tonnes deposited annually. Microplastics have therefore entered a global atmospheric cycle rather than remaining a purely aquatic problem.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Allen 等（2019）《Nature Geoscience》；Brahney 等（2020）《Science》
Allen et al. (2019), Nature Geoscience; Brahney et al. (2020), Science
#大气微塑料 #长距离输运 #干湿沉降
化学回收与传统机械回收有何不同？
How does chemical recycling differ from conventional mechanical recycling?
机械回收通过清洗、破碎、熔融再造粒，过程简单但会使材料性能下降。化学回收用解聚、热解或气化把塑料还原成单体或油类原料，可处理混杂和受污染塑料并保持品质。其缺点是能耗高、成本大，目前多处于示范阶段。
Mechanical recycling cleans, shreds and re-pelletises plastic; it is simple but degrades material quality. Chemical recycling uses depolymerisation, pyrolysis or gasification to revert plastic to monomers or oil, handling mixed and contaminated feedstock while preserving quality. Its downside is high energy cost, and it remains mostly at demonstration scale.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《Nature Sustainability》塑料回收综述
Nature Sustainability recycling review
#化学回收 #机械回收 #解聚
每年究竟有多少塑料进入海洋？为什么不同研究给出的数字差异很大？
How much plastic really enters the ocean each year, and why do estimates differ so widely?
被广泛引用的 Jambeck 等 2015 年《Science》研究，基于沿海人口的废物产生量与管理不当比例，估算 2010 年有 480 万至 1270 万吨塑料进入海洋。后续以河流输运实测为基础的研究把年输入量估到 80 万至 270 万吨，差距源于方法路径不同：一种自上而下推算陆源废物流，另一种自下而上测量河口通量。两类结果都表明输入集中在少数缺乏收运体系的河流和海岸段，因此改善废物管理比单纯清捞更关键。
The widely cited Jambeck et al. 2015 study in Science estimated 4.8–12.7 million tonnes entered the ocean in 2010, working from coastal population waste generation and the share that is mismanaged. Later work built on measured river transport put annual input at 0.8–2.7 million tonnes; the gap reflects method, one estimating land-based waste streams top-down and the other measuring estuary fluxes bottom-up. Both point to a concentration of inputs in a limited number of rivers and coastlines lacking collection systems, which makes waste management more decisive than ocean cleanup.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Jambeck 等（2015）《Science》；Meijer 等（2021）《Science Advances》河流塑料输入研究
Jambeck et al. (2015), Science; Meijer et al. (2021), Science Advances, river plastic inputs
#海洋塑料 #废物管理 #通量估算
“生产者责任延伸”制度是如何运作的？它能解决回收难题吗？
How does Extended Producer Responsibility work, and can it solve the recycling challenge?
生产者责任延伸（EPR）要求制造商对其产品的全生命周期负责，包括用后回收与处置。常见做法有饮料瓶押金制、电子产品回收基金、包装回收配额。它的巧妙之处在于把回收成本内部化进产品价格，激励企业主动设计成更易回收、更耐用的产品。EPR因此成为许多国家推行循环经济的核心政策工具。
Extended Producer Responsibility (EPR) makes manufacturers accountable for their products across the life cycle, including take-back and disposal after use. Typical designs include bottle deposit schemes, e-waste recovery funds and packaging recycling quotas. The trick is that recycling costs are internalised in product prices, so companies are incentivised to design goods that are easier to recover and last longer. That makes EPR a core policy tool of the circular economy.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#生产者责任延伸 #EPR #押金制
什么是微塑料？有哪些证据表明它们会在食物网中发生营养级传递？
What are microplastics and what evidence links them to trophic transfer in food webs?
微塑料是直径小于 5 毫米的塑料碎片，源自大塑料破碎与化妆品微珠等。研究已在浮游动物、鱼类乃至人体血液与胎盘中检出，显示其可经捕食从低营养级向高营养级传递与富集。
Microplastics are plastic fragments under 5 mm from the breakdown of larger plastic and microbeads. They have been detected in zooplankton, fish, and even human blood and placenta, showing trophic transfer and accumulation from lower to higher levels via predation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Cole, Lindeque, Halsband, Galloway,《Microplastics as contaminants in the marine environment: A review》,Marine Pollution Bulletin,2011 (DOI: 10.1016/j.marpolbul.2011.09.025)
Cole, Lindeque, Halsband, Galloway, 'Microplastics as contaminants in the marine environment: A review', Marine Pollution Bulletin, 2011, DOI: 10.1016/j.marpolbul.2011.09.025
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1016/j.marpolbul.2011.09.025
#微塑料 #食物网 #营养级传递
海洋塑料垃圾的主要来源是哪里？
What are the main sources of marine plastic litter?
约八成海洋塑料来自陆地，经河流和城市径流带入，其余来自渔业丢弃的渔网和海上航运。亚洲几条大型河流是重要输运通道。源头减塑和完善沿岸垃圾收集比事后打捞更有效。
About 80 percent of marine plastic originates on land and reaches the sea via rivers and urban runoff, with the rest from discarded fishing nets and shipping. Several large Asian rivers are major transport pathways. Source reduction and better coastal waste collection beat post-hoc cleanup.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#海洋塑料 #河流输运 #源头减塑
为什么回收的塑料往往被降级使用？
Why is recycled plastic often downcycled?
每次机械回收都会使聚合物链变短、引入杂质，导致强度下降和颜色变差。因此回收料常被做成要求较低的产品，如花盆、管道而非食品级包装。要维持品质需补充新料或采用化学回收。
Each mechanical recycle shortens polymer chains and introduces impurities, lowering strength and colour quality. Recyclate is therefore often made into lower-demand products like planters or pipes rather than food-grade packaging. Maintaining quality needs virgin feedstock blending or chemical recycling.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#降级回收 #聚合物 #再生料
为什么PET瓶可以回收而多数保鲜膜不能？
Why can PET bottles be recycled but most cling films cannot?
PET饮料瓶是单一材质、易清洗且回收价值高，可重新造粒做成纤维或新瓶。多数保鲜膜是低密度聚乙烯或聚氯乙烯，常沾油污、与其他塑料混杂，且薄膜分选困难，经济价值低。材质混杂和分选成本是薄膜难回收的关键。
PET drink bottles are single-material, easy to clean and valuable, so they can be re-pelletised into fibres or new bottles. Most cling films are LDPE or PVC, often greasy, mixed with other plastics and hard to sort as films, with low economic value. Material mixing and sorting cost are the key barriers.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#塑料回收 #PET #保鲜膜
全球电子废弃物流向何方？为什么回收率偏低？
Where does the world's e-waste go, and why are recycling rates so low?
全球每年产生数千万吨电子废弃物，且增速快于回收。一部分进入正规回收链，另一部分被非法出口到发展中国家，由非正规工场露天拆解，在回收价值金属的同时释放铅、汞等毒素。回收率低的原因包括收集体系不完善、产品设计难以拆解，以及消费者把旧设备积存在家里不愿交投。
The world generates tens of millions of tonnes of e-waste every year, growing faster than recycling. Some enters formal recycling chains; another share is illegally exported to developing countries, where informal workshops strip it in the open, recovering valuable metals while releasing lead and mercury. Low recycling rates stem from incomplete collection systems, designs that resist dismantling, and consumers hoarding old devices at home.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
戴树桂 主编,《环境化学》第2版,高等教育出版社,2006
Dai Shugui ed., Environmental Chemistry, 2nd ed., Higher Education Press, 2006
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040199567（按标识回读: 环境化学）
#电子废弃物 #非法出口 #回收率
维修权立法如何从制度上延长产品寿命？
How does right-to-repair legislation extend product lifetimes through regulation?
维修权立法把可维修性变成产品设计的法律义务：要求厂商在合理期限内供应备件与维修手册、允许独立维修商获得诊断工具与固件、限制以序列号绑定阻止更换零件，并在标签上公示可维修性评分。欧盟通过生态设计法规为多类家电设定备件供应年限，随后又出台促进维修的专门指令，法国则强制标注维修指数。制度约束之所以必要，是因为单靠市场竞争，厂商更倾向以更短的更新周期获利，而维修的环境收益体现在避免新产品制造带来的隐含排放。
Right-to-repair rules turn repairability into a legal design obligation: manufacturers must supply spare parts and service manuals for a defined period, independent repairers must be able to obtain diagnostic tools and firmware, serial-number pairing that blocks part replacement is restricted, and repairability scores appear on labels. The EU set minimum spare-part availability periods for several appliance categories through its ecodesign framework and later adopted a directive promoting repair, while France requires a repairability index. Regulation is needed because competition alone rewards shorter replacement cycles, whereas the environmental benefit of repair lies in avoiding the embodied emissions of manufacturing a new unit.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
欧盟生态设计框架法规及促进商品维修的指令（Directive (EU) 2024/1799）；法国维修指数（indice de réparabilité）政策文件
EU ecodesign framework regulations and Directive (EU) 2024/1799 on the promotion of the repair of goods; France's repairability index (indice de reparabilite) policy documents
#维修权 #生态设计 #产品寿命
废弃渔网对海洋生物有哪些危害？
What harm do abandoned fishing nets cause to marine life?
被丢弃或遗失的幽灵渔网会在海中继续缠绕鱼类、海龟和哺乳动物，造成窒息和受伤。它们多由耐久的合成纤维制成，可存在数百年并碎裂为微塑料。回收再利用这些尼龙网既能救生物也能减少原生塑料。
Abandoned or lost ghost nets keep entangling fish, turtles and mammals, causing suffocation and injury. Made of durable synthetics, they persist for centuries and break into microplastics. Recycling these nylon nets saves wildlife and cuts virgin plastic.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#幽灵渔网 #海洋生物 #微塑料
什么是“生态设计”？为什么说产品环境影响在设计时已“注定”？
What is ecological design, and why is a product's environmental impact said to be fixed at the design stage?
生态设计（Design for the Environment）在产品研发阶段就把环境因素纳入考量：减少材料用量、采用易拆解结构、方便维修升级、优先可再生材料。研究表明产品约八成的环境影响在设计阶段就被锁定，后续很难改变。所以循环经济强调“从源头设计”，而非等废弃后再想办法。
Ecological design (Design for the Environment) builds environmental thinking into the R&D stage: less material, easily disassembled structures, repairable and upgradeable designs, and renewable materials. Research suggests roughly 80 percent of a product's environmental impact is locked in at the design phase and hard to change later. That is why the circular economy insists on designing at the source rather than fixing problems after disposal.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#生态设计 #绿色设计 #可拆解
光伏板和风机叶片可以回收吗？回收难在哪里？
Can solar panels and wind-turbine blades be recycled, and what makes it hard?
光伏板主体的玻璃、铝框和硅大部分可回收，退役后能拆解提取银、铜等材料；难点在于封装胶膜使层间分离耗能，回收成本一度高于材料本身的价值。风机叶片由玻璃纤维复合材料制成，回收更加困难。欧盟和行业正通过设计标准和押金回收机制推动“为回收而设计”。
Most of a solar panel — glass, aluminum frame, and silicon — is recyclable, yielding silver and copper after decommissioning; the challenge is the energy-intensive separation of encapsulant layers, with recycling historically costing more than the recovered materials. Wind blades, made of glass-fibre composite, are harder still. The EU and industry are driving design-for-recycling through standards and deposit-return schemes.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
IRENA与IEA-PVPS《光伏组件退役管理前瞻》(End-of-Life Management: Solar PV Panels), 2016
IRENA & IEA-PVPS, End-of-Life Management: Solar Photovoltaic Panels, 2016
#光伏回收 #风机叶片 #为回收而设计
电子废弃物的“拆解与再制造”和简单粉碎回收有什么不同？
How does dismantling and remanufacturing of e-waste differ from simple shredding?
简单粉碎回收只能回收部分金属，稀有材料和价值高的部件会被混料破坏；规范拆解则先分离电路板、电池、屏幕和塑料，再对功能完好的模块检测、修复并再制造，进入二手或翻新市场，可比原生制造减少八成以上的原材料和能源投入。再制造既保留了产品蕴含的价值，也创造了就业。
Simple shredding recovers only part of the metals and destroys rare materials and valuable components in the mix. Standardised dismantling first separates boards, batteries, screens, and plastics, then tests and refurbishes working modules for resale or remanufacturing, cutting raw-material and energy inputs by over 80% versus virgin production. Remanufacturing preserves embedded value and creates jobs.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Stahel W R，《绩效经济》（第2版），Palgrave Macmillan，2010
Stahel, W. R., The Performance Economy, 2nd ed., Palgrave Macmillan, 2010
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL19893952W：The performance econom
#再制造 #拆解 #资源循环
为什么各国禁限塑往往先从一次性塑料制品开刀？
Why do plastic restrictions usually start with single-use items?
一次性塑料杯、吸管、餐具和塑料袋的使用时间常常只有几分钟，却可能在环境中存留数百年，还特别容易泄漏到河流海洋。限制它们的替代方案成熟、成本低、容易执行，能快速见效。同时政策强调：替代品也要做全生命周期评估，不能简单用可降解名义掩盖掩埋问题。
Single-use cups, straws, cutlery and bags are used for minutes yet can persist in the environment for centuries, and they leak into rivers and oceans particularly easily. Alternatives are mature, cheap and easy to enforce, so restricting these items brings fast results. Policies also insist that substitutes be assessed over their full life cycle — a biodegradable label is not a licence to bury plastic in landfill.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#禁塑令 #一次性塑料 #替代品
循环经济的“3R”原则具体指什么？它们有先后顺序吗？
What are the 3Rs of the circular economy, and does their order matter?
3R指减量化（Reduce）、再利用（Reuse）和再循环（Recycle）。顺序很重要：首先是少用少买，其次是让物品重复使用，最后才把材料回收再造。近年还扩展出拒绝（Refuse）和修复（Repair），因为回收本身也消耗能源。遵循这个顺序，资源才能留在循环里而不是变成垃圾。
The 3Rs are Reduce, Reuse and Recycle — and the order matters. First buy and consume less, then keep things in use longer, and only as a last step turn materials back into new products. Recent versions add Refuse and Repair, because recycling itself consumes energy. Following this sequence keeps resources circulating instead of becoming waste.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#循环经济 #3R #减量复用回收
全球电子废物为何增长远快于回收能力？
Why is global e-waste growing far faster than the capacity to recycle it?
《全球电子废物监测》报告显示，2022 年全球产生约 6200 万吨电子废物，而有据可查的正规回收率仅约两成二。增长动力来自设备保有量上升、更新周期缩短与可维修性下降，胶粘封装和一体化电池让拆解变得费时；同时正规回收厂需要处理数十种混合材料，经济性依赖金、钯等少量贵金属。大量废物因此流入非正规拆解渠道，用露天焚烧和酸浸提取金属，造成二噁英与重金属污染。
The Global E-waste Monitor reports about 62 million tonnes generated in 2022 while only roughly 22% was documented as formally collected and recycled. Growth is driven by rising device ownership, shorter replacement cycles, and declining repairability, as glued enclosures and embedded batteries make disassembly slow; formal recyclers meanwhile must separate dozens of mixed materials and depend economically on small amounts of gold and palladium. Much of the stream therefore reaches informal dismantling, where open burning and acid leaching recover metals while releasing dioxins and heavy metals.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
《全球电子废物监测报告 2024》（联合国训练研究所与国际电信联盟）；巴塞尔公约秘书处
Global E-waste Monitor 2024 (UNITAR and ITU); Secretariat of the Basel Convention
#电子废物 #回收率 #非正规拆解
为何 PET（聚对苯二甲酸乙二醇酯）是最常被回收的塑料之一？其循环化又受何限制？
What makes PET (polyethylene terephthalate) one of the most recycled plastics, and what limits its circularity?
PET 广泛用于饮料瓶，熔点高、易分选且可熔融再造粒，因此回收体系成熟。但多次热加工会降解聚合物链、需掺入新料，且标签与有色瓶降低再生质量，限制闭环循环。
PET is common in bottles, has a high melting point, sorts easily, and can be remelted into pellets, so its recycling infrastructure is mature. Yet repeated heating degrades polymer chains, requiring virgin feedstock, and labels or colored bottles lower recyclate quality, limiting closed-loop use.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#PET #塑料回收 #闭环循环
用再生塑料做新瓶子和衣服，有哪些现实挑战？
What practical challenges stand in the way of making new bottles and clothes from recycled plastic?
再生PET（rPET）饮料瓶和再生纤维已很常见，与原生料相比可显著减少碳排放。但回收塑料面临分拣困难、性能波动和杂质污染等问题，食品级再生还需严格认证。提升回收率要靠更精细的分拣体系和生产者责任延伸制度，让再生材料在成本和质量上更有竞争力。
Recycled PET bottles and recycled fibres are now common and cut carbon significantly versus virgin materials. But recycled plastics face difficult sorting, variable quality and contamination, and food-grade recycling needs strict certification. Higher recycling rates depend on finer sorting systems and Extended Producer Responsibility, so recycled content becomes competitive on both cost and quality.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#再生材料 #rPET #回收体系
什么是生物基塑料，它真的更环保吗？
What are bio-based plastics, and are they really greener?
生物基塑料由玉米、甘蔗等生物质原料制成，如聚乳酸PLA，其原料端可减少化石依赖。但它并不等于可降解，许多生物基塑料仍需工业堆肥条件才能分解，且种植原料会占用土地和水。是否更环保取决于全生命周期的能耗、土地利用和回收体系。
Bio-based plastics are made from biomass feedstocks like corn or sugarcane, such as PLA, which can reduce fossil dependence at the raw-material stage. But they are not automatically biodegradable; many need industrial composting and their crops use land and water. Whether they are greener depends on the full life-cycle energy, land use and recycling system.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#生物基塑料 #PLA #生命周期
全球塑料公约谈判的目标是什么？
What is the goal of the global plastics treaty negotiations?
联合国主导的塑料公约旨在达成一项具有法律约束力的文件，覆盖塑料全生命周期，从生产限制到末端治理。它强调减少原生塑料产量、杜绝塑料污染泄漏并促进公平转型。谈判焦点包括是否设定产量上限和资金机制。
The UN-led plastics treaty aims for a legally binding instrument covering the full plastic life cycle, from production limits to end-of-life management. It stresses cutting virgin plastic output, stopping leakage and enabling a just transition. Key debates include whether to cap production and how to fund implementation.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
联合国环境大会第5/14号决议(2022)及UNEP塑料公约谈判(INC)官方文件
UNEA Resolution 5/14 (2022) and UNEP Global Plastics Treaty INC negotiation documents
#塑料公约 #全球治理 #全生命周期
可降解塑料在普通填埋场能分解吗？
Can biodegradable plastics break down in ordinary landfills?
多数可降解塑料需要工业堆肥的高温高湿和特定微生物条件才能分解，普通填埋场缺氧且温度低，分解极慢甚至长期残留。若混入传统塑料回收流还会降低再生料质量。因此可降解不等于随意丢弃。
Most biodegradable plastics need the high heat, moisture and specific microbes of industrial composting; ordinary landfills are oxygen-poor and cool, so breakdown is very slow or they persist. Mixed into conventional recycling they also lower recyclate quality. Biodegradable therefore does not mean discard anywhere.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#可降解塑料 #填埋 #工业堆肥
海洋里的塑料会伤害海洋动物吗？
Can plastic in the ocean hurt sea animals?
会。海龟可能把塑料袋误认成水母吃下，海鸟会被塑料缠住。塑料要很久才消失，所以少丢塑料能救很多动物。
Yes. Sea turtles may swallow plastic bags mistaking them for jellyfish, and seabirds get tangled. Plastic takes very long to disappear, so using less saves many animals.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#海洋塑料 #动物伤害 #海洋垃圾
塑料回收代码1到7分别代表什么？
What do plastic recycling codes 1 to 7 stand for?
三角箭头中的数字1至7标识树脂种类：1是PET，2是HDPE，3是PVC，4是LDPE，5是PP，6是PS，7是其他类。它帮助分拣但不保证当地一定能回收。了解代码有助于正确投放和选择易回收包装。
The numbers 1 to 7 in the recycling triangle identify resin type: 1 PET, 2 HDPE, 3 PVC, 4 LDPE, 5 PP, 6 PS, 7 others. They aid sorting but do not guarantee local recyclability. Knowing the codes helps correct disposal and choosing recyclable packaging.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#树脂代码 #塑料分类 #回收标识
微塑料的粒径定义是什么？
What is the size definition of microplastics?
微塑料通常指粒径小于五毫米的塑料颗粒，包括生产时就制成的微珠和由大塑料破碎形成的次级碎片。纳米塑料则指小于一微米的更小颗粒。由于体积极小，它们易进入生物组织和食物链。
Microplastics are generally plastic particles under 5 millimetres, including manufactured microbeads and fragments broken from larger plastic. Nanoplastics are smaller than one micrometre. Their tiny size lets them enter tissues and food chains.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#微塑料 #粒径 #纳米塑料
海洋中最大的塑料聚集区在哪里？
Where is the largest accumulation of ocean plastic?
北太平洋环流形成的垃圾带是全球最大，面积可达数百万平方公里，由洋流把塑料碎片汇聚而成。它并非实体岛屿，而是分散在海面及水柱中的碎屑浓度区。清理难度大，预防入海更关键。
The North Pacific gyre forms the largest accumulation, spanning millions of square kilometres as currents gather fragments. It is not a solid island but a zone of elevated debris across the surface and water column. Cleanup is hard; preventing entry to the sea matters more.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#太平洋垃圾带 #洋流 #海洋塑料
重复使用购物袋为什么能减塑？
Why does reusing shopping bags reduce plastic?
一次性塑料袋使用时间短却消耗石化原料并产生废弃，重复使用布袋或厚质袋可摊薄单次环境成本。研究认为一只布袋需重复使用数十次才能抵消其生产能耗。关键是真正多次使用而非囤积。
Single-use plastic bags consume petrochemicals and create waste for only minutes of use, while a reusable cloth or thick bag spreads its environmental cost over many trips. Studies suggest a cloth bag must be reused dozens of times to offset its production energy. The point is real repeated use, not hoarding.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#减塑 #可重复使用 #购物袋
循环经济的核心原则是什么？
What are the core principles of the circular economy?
循环经济以减量化、再利用、再循环为核心，目标是让资源在系统中尽可能长久地保持价值。它强调产品设计易于维修和回收，并用可再生能源替代。与线性经济相比，它力求减少废弃物和原生资源开采。
The circular economy centres on reducing, reusing and recycling, aiming to keep resources in use at high value for as long as possible. It stresses products designed for repair and recyclability and shifts to renewable energy. Unlike the linear model, it seeks to minimise waste and primary extraction.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
左玉辉 主编,《环境学》第2版,高等教育出版社,2009
Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040283327（按标识回读: 环境学）
#循环经济 #减量化 #再利用