📚 Sustainability Indicators Enter the QS World University Rankings for the First Time in the 20th Edition | 可持续性指标首次加入第20版QS世界大学排名
Every year produces a new set of league tables, but only rarely does a league table change what it actually measures. In its twentieth edition, released in June 2023 and covering the 2023/24 admissions cycle, the QS World University Rankings did exactly that: for the first time, sustainability became a scored indicator, carrying 5 per cent of a university's total result. For A-Level students choosing courses, writing personal statements, or studying sustainability in Geography and Economics, this shift is more than ranking trivia - it is a case study in how measurement shapes behaviour.
每年都会有新的大学排行榜出炉，但真正改变排行榜衡量内容的却少之又少。第20版QS世界大学排名于2023年6月发布，对应2023/24申请季，首次把"可持续性"（Sustainability）纳入计分指标，占高校总评分的5%。对于正在选校、写个人陈述，或在A-Level地理与经济课程中学习可持续发展的学生来说，这不只是排行榜的八卦，而是一个"测量方式如何影响行为"的鲜活案例。
1. The 20th Edition at a Glance | 第20版概览
The 20th edition of the QS World University Rankings was published on 27 June 2023. It covered approximately 1,500 institutions across 104 locations, making it the largest edition in the ranking's history at that point. Massachusetts Institute of Technology (MIT) took first place for the twelfth consecutive year, followed by the University of Cambridge and the University of Oxford.
第20版QS世界大学排名于2023年6月27日发布，收录来自104个地区的约1500所高校，是当时该榜单历史上规模最大的一版。麻省理工学院（MIT）连续第12年排名第一，剑桥大学与牛津大学紧随其后。
What made this edition distinctive was not the top of the table but the structure of the table itself. Three new indicators entered the methodology, and existing weights were redistributed. The result was a ranking that attempted to price in something previously treated as reputation alone: environmental and social performance.
这一版真正的特别之处不在榜首，而在榜单的构造方式：三项全新指标进入方法论，原有权重随之重新分配。其结果是，一种过去只被当作"声誉"的东西——环境与社会表现——第一次被赋予了明确的分值。
2. The Three New Indicators | 三大新增指标
QS added three indicators simultaneously in the 20th edition. Together they account for 15 per cent of a university's total score, which is a substantial share in a methodology that had barely changed for years.
QS在第20版中一次性新增了三项指标，合计占高校总评分的15%。在一个多年几乎不变的方法论中，这是相当可观的比例。
- Sustainability (5%) - measures environmental and social sustainability performance, drawn from QS's dedicated sustainability dataset. | 可持续性（5%）——衡量高校在环境与社会可持续发展方面的表现，数据来自QS专门的可持续性评估体系。
- Employment Outcomes (5%) - measures how well graduates perform in the labour market, including employability, career impact and alumni achievement. | 就业成果（5%）——衡量毕业生在劳动力市场的表现，涵盖就业竞争力、职业影响力与校友成就。
- International Research Network (5%) - measures the proportion and diversity of internationally co-authored research publications, aligned with the idea of cross-border research partnerships. | 国际研究网络（5%）——衡量国际合著论文的比例与多样性，呼应跨国研究合作这一理念。
Notice the logic: the two indicators that lost weight - academic reputation and faculty-student ratio - are both input- or prestige-based, while the new indicators lean towards outcomes and external impact. That rebalancing is the real story of the 20th edition.
注意其中的逻辑：权重被削减的两项指标——学术声誉与师生比——都属于"投入型"或"声望型"指标，而新增指标更偏向"产出"与"外部影响"。这种再平衡，才是第20版真正的故事。
3. Weightings Before and After | 权重前后对比
The table below compares the indicator weights in the 19th edition (2023) with those in the 20th edition (2024). Each weight is a percentage of the total score, and each must sum to 100.
下表对比第19版（2023年）与第20版（2024年）的指标权重。每个权重都是总评分的百分数，且各项之和必须等于100。
| Indicator | 指标 | 2023 weight | 2023年权重 | 2024 weight (20th) | 第20版权重 | Change | 变化 |
|---|---|---|---|
| Academic Reputation | 学术声誉 | 40% | 30% | −10 pp |
| Citations per Faculty | 师均引用 | 20% | 20% | 0 |
| Faculty-Student Ratio | 师生比 | 20% | 10% | −10 pp |
| Employer Reputation | 雇主声誉 | 10% | 15% | +5 pp |
| International Faculty Ratio | 国际教师比 | 5% | 5% | 0 |
| International Students Ratio | 国际学生比 | 5% | 5% | 0 |
| Sustainability | 可持续性 | not scored | 未计分 | 5% | new | 新增 |
| Employment Outcomes | 就业成果 | not scored | 未计分 | 5% | new | 新增 |
| International Research Network | 国际研究网络 | not scored | 未计分 | 5% | new | 新增 |
The arithmetic of a composite score is simple. If wᵢ is the weight of indicator i and sᵢ is the university's normalised score on that indicator, then:
加权总分的算法本身很直接。设 wᵢ 为第 i 项指标的权重，sᵢ 为该大学在这一指标上的标准化得分，则：
Total = Σ (wᵢ × sᵢ), where Σ wᵢ = 100%
A 10 percentage-point reduction in the academic reputation weight is therefore not cosmetic. For a university whose reputation score is far above its sustainability score, the composite total must fall; for a university with strong sustainability metrics but a modest reputation, the total rises. Rankings are zero-sum games played with weighted averages.
因此，学术声誉权重下降10个百分点绝非"表面调整"。对于声誉得分远高于可持续性得分的高校，总分会下降；而对于可持续性表现优异、声誉一般的高校，总分则会上升。排行榜本质上是一场用加权平均数进行的零和博弈。
4. What the Sustainability Indicator Actually Measures | 可持续性指标究竟测什么
QS describes the sustainability indicator in the World University Rankings as being derived from its dedicated sustainability assessment, which evaluates both environmental and social performance. In simplified, illustrative form, the logic can be written as a two-part composite:
QS表示，世界大学排名中的可持续性指标取自其专门的可持续性评估体系，该体系同时考察环境表现与社会表现。用简化的示意形式表示，其逻辑可以写成一个由两部分构成的合成指标：
Sustainability ≈ ½ × Environmental score + ½ × Social score
This structure matters because it prevents "sustainability" from being reduced to carbon emissions alone. A university with a carbon-neutral campus but poor staff equality metrics does not automatically score well; neither does a university with excellent equality records but no environmental strategy.
这种结构很重要，因为它避免了把"可持续性"简化为碳排放这一个维度。一所校园碳中和但员工平等指标糟糕的大学，未必能拿高分；同样，一所平等记录出色却毫无环境战略的大学也不行。
For students, the practical implication is that sustainability scores reflect institutional strategy, not individual lifestyle. They describe what an institution does at scale - what it teaches, what it researches, how it operates, and whom it serves.
对学生的实际启示是：可持续性得分反映的是"机构战略"，而不是个人生活方式。它描述的是大学在规模层面做了什么——教什么、研究什么、如何运营、为谁服务。
5. The Environmental Pillar Explained | 环境支柱解析
The environmental dimension of the sustainability assessment is typically organised around three broad areas. Each one asks a different question about the institution.
可持续性评估中的环境维度通常围绕三大领域展开，每一个领域都在追问关于这所大学的不同问题。
- Sustainable institutions | 可持续的机构 - Does the university manage its own estate responsibly? This covers campus energy use, greenhouse gas emissions, waste and water management, sustainable procurement, and whether the endowment is invested in fossil fuels or in low-carbon assets. | 可持续的机构——大学是否负责任地管理自身资产？包括校园能耗、温室气体排放、废弃物与水资源管理、可持续采购，以及校产基金是否投资于化石燃料或低碳资产。
- Sustainable education | 可持续的教育 - Does the university teach sustainability? This includes the availability of sustainability-related modules and degrees, the proportion of graduates who acquire green skills, and institutional commitments to education for sustainable development. | 可持续的教育——大学是否教授可持续发展？包括可持续相关课程与学位的供给、获得绿色技能的毕业生比例，以及高校在教育促进可持续发展方面的承诺。
- Sustainable research | 可持续的研究 - Does the university produce research that addresses environmental challenges? This is measured through publication output and citation impact in sustainability-related fields, including work linked to climate science, clean energy, biodiversity and the UN Sustainable Development Goals. | 可持续的研究——大学是否产出应对环境挑战的研究？通过可持续相关领域的论文产出与引用影响力衡量，涵盖气候科学、清洁能源、生物多样性与联合国可持续发展目标相关工作。
Within a geography framework, these three areas map neatly onto the idea of scale: institution-level operations, individual-level learning, and society-level knowledge production.
在地理学的框架中，这三个领域恰好对应"尺度"概念：机构层面的运营、个人层面的学习，以及社会层面的知识生产。
6. The Social Pillar Explained | 社会支柱解析
The social dimension is often the part students overlook, yet it carries roughly half the sustainability score. It asks whether a university improves the society it sits within.
社会维度常常被学生忽视，但它几乎占据了可持续性得分的一半。它追问的是：这所大学是否改善了它所处的社会？
- Equality | 平等 - gender and minority representation among students and staff, access initiatives, disability support, and pay-gap transparency. | 平等——学生与教职工中的性别与少数群体代表性、招生机会拓展、残障支持以及薪酬差距透明度。
- Knowledge exchange | 知识交流 - whether research and expertise reach beyond campus, through public engagement, partnerships with local government, schools and industry. | 知识交流——研究与专业知识是否走出校园，通过公众参与、与地方政府、学校及产业的合作实现传播。
- Employability and opportunities | 就业与机会 - graduate outcomes, career services and the extent to which the university widens access to professional employment. | 就业与机会——毕业生去向、职业服务，以及大学在多大程度上拓宽了通往专业就业的通道。
- Health and wellbeing | 健康与福祉 - student mental health provision, sports and wellbeing facilities, and research contributions to public health. | 健康与福祉——学生心理健康服务、体育与福祉设施，以及对公共卫生研究的贡献。
- Impact of education | 教育的影响力 - the long-run social value of the university's teaching, including alumni contributions to education, health and civic life. | 教育的影响力——大学教学带来的长期社会价值，包括校友在教育、健康与公共生活中的贡献。
This structure makes the sustainability indicator unusual: it is one of the few metrics in the ranking that explicitly rewards universities for reducing inequality rather than merely producing prestige.
这一结构使可持续性指标显得与众不同：在整份榜单中，它是少数明确奖励"减少不平等"而非单纯"制造声望"的指标之一。
7. Scoring and Methodology | 评分与方法论
Raw indicator values are not directly comparable. A university with 60,000 students will produce different absolute numbers from one with 6,000, so QS standardises each indicator before weighting it. The standard tool is the z-score:
原始指标数值无法直接比较。一所拥有6万名学生的大学，其绝对数值必然与只有6千名学生的大学不同，因此QS在加权之前会对每项指标进行标准化处理。常用工具是 z 分数（标准分数）：
z = (x − μ) ÷ σ
Here x is the university's raw value, μ is the mean across the ranked institutions, and σ is the standard deviation. A positive z-score means the university is above average on that indicator; a negative score means it is below. Because z-scores are dimensionless, they can be combined across indicators measured in completely different units - survey responses, citation counts, staff headcounts.
其中 x 是该大学的原始数值，μ 是入榜院校的平均值，σ 是标准差。z 为正表示该指标高于平均，为负则表示低于平均。由于 z 分数没有单位，因此可以跨指标相加——即便这些指标分别以问卷回答、引用次数、教职工人数等完全不同的单位计量。
The data sources behind the sustainability indicator include institutional data submissions, bibliometric databases such as Scopus, and external datasets covering environmental and social performance. That mix creates both strength and vulnerability: bibliometric data are consistent and comparable, whereas self-submitted data depend on what institutions choose to report and how they define it.
可持续性指标的数据来源包括高校自行提交的数据、Scopus 等文献计量数据库，以及涵盖环境与社会表现的外部数据集。这种组合既带来优势也带来风险：文献计量数据一致且可比，而自报数据则取决于高校选择报告什么、以及如何定义所报告的内容。
8. Critical Limitations | 局限与批评
A strong essay answer, or a strong interview discussion, acknowledges the weaknesses of the metric rather than simply celebrating it. Four criticisms are particularly common.
一篇优秀的小论文，或一场出色的面试讨论，都会承认这一指标的弱点，而不只是为它喝彩。以下四点批评尤为常见。
- Reporting bias | 报告偏差 - richer universities employ sustainability officers who can compile detailed submissions. The metric may partly measure administrative capacity rather than environmental performance. | 报告偏差——资金雄厚的高校聘有专职可持续发展专员，能够整理详细的申报材料，因此该指标可能部分衡量的是行政能力，而非环境绩效。
- Scale bias | 规模偏差 - large research-intensive universities generate more sustainability-related publications and citations almost by default, which favours them over smaller teaching-focused institutions. | 规模偏差——大型研究型大学天然产出更多可持续相关论文与引用，这对它们更有利，而对以教学为主的小型院校不利。
- Metric gaming and Goodhart's Law | 指标博弈与古德哈特定律 - when a measure becomes a target, it ceases to be a good measure. Universities may rebrand modules as sustainability-related without changing their content. | 指标博弈与古德哈特定律——当一种度量变成目标，它就不再是好的度量。高校可能只是把课程"重新贴牌"为可持续相关，而内容并未改变。
- Only 5 per cent | 仅占5% - with sustainability at 5 per cent, a perfect sustainability score cannot compensate for a weak reputation score. The ranking is still dominated by prestige. | 仅占5%——可持续性只占5%，即使拿到满分也无法弥补声誉得分的劣势。榜单仍由声望主导。
The honest conclusion is that the sustainability indicator is a meaningful signal about institutional direction, but it is not a measurement of a university's total environmental footprint, and it should never be read in isolation from the other indicators.
诚实的结论是：可持续性指标是关于"机构方向"的一个有意义的信号，但它并不等同于大学总体环境足迹的测量，也绝不应脱离其他指标单独解读。
9. How QS Compares with Other Rankings | QS与其他排名的对比
QS is not the only organisation measuring sustainability in higher education, and comparing methodologies is an excellent exercise in critical thinking.
QS并非唯一衡量高校可持续性的机构，比较不同方法论
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