📚 Global Commons: Concept and Protection | 全球公地的概念与保护
Global commons are places and resources that no single country owns or controls, but on which everyone depends. In geography, the term is used to describe shared environmental systems such as the high seas, the atmosphere, Antarctica, and outer space. Because these areas are outside national borders, their protection depends on international cooperation, shared rules, and mutual responsibility.
全球公地是指不受任何单一国家主权管辖、却为全人类共同依赖的区域与资源。在地理学科中，这个概念通常涵盖公海、大气层、南极洲和外层空间等关键环境系统。由于这些区域位于国家边界之外，对它们的保护依赖国际合作、共同规则和各国的相互责任。
1. Definition and Meaning | 全球公地的定义与含义
A global common is often defined as an area or resource that is open to all states and to all people, yet cannot be enclosed by any one state. It has two essential features: it is non-excludable, meaning nobody can easily be stopped from using it; and it is finite, meaning overuse by one user reduces what is available to everyone else.
全球公地通常指对所有国家和所有人开放、但不能被任一国家独占的区域或资源。它有两个关键特征：一是“非排他性”，即很难阻止任何人利用它；二是“有限性”，即某一使用者的过度利用会减少其他人可获得的资源。
The idea of the global commons is important in physical, human, and environmental geography. It connects ideas about ecosystems, resources, sovereignty, and sustainable development.
全球公地概念在自然地理、人文地理和环境地理中都很重要，它将生态系统、资源利用、国家主权与可持续发展等议题联系在一起。
2. The Main Global Commons | 主要全球公地
Although many resources are shared internationally, the four areas most commonly identified as global commons are the high seas and deep seabed, the atmosphere, Antarctica, and outer space.
尽管许多资源都是国际共享的，但最常被视为全球公地的四大区域是：公海与深海底、大气层、南极洲和外层空间。
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High seas and the deep seabed. The high seas are the ocean areas beyond the 200-nautical-mile exclusive economic zone (EEZ) of any coastal state. They cover about 64% of the world's oceans and about 45% of the Earth's surface. The deep seabed beyond national jurisdiction is called the Area.
公海与深海底。公海是超出任何沿海国200海里专属经济区之外的海域，约占全球海洋面积的64%，约占地球表面的45%。国家管辖范围以外的深海底被称为“区域”。
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The atmosphere. The Earth's atmosphere is a shared resource because air moves across borders and depositions of pollution and greenhouse gases affect the whole planet. It regulates climate, weather, and the distribution of freshwater.
大气层。地球大气层是一种共享资源，因为空气会跨越国界流动，污染物和温室气体的排放会影响整个地球。大气层调节气候、天气和淡水的分布。
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Antarctica. Antarctica is not owned by any nation. Since the Antarctic Treaty of 1959, territorial claims have been frozen, and the continent is supposed to be used only for peace and science.
南极洲。南极洲不属于任何国家。根据1959年《南极条约》，各国领土主权要求被冻结，该大陆只应被用于和平与科学目的。
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Outer space. Under the Outer Space Treaty of 1967, no state can claim sovereignty over the Moon, planets, or any other celestial body. Outer space is to be explored and used for the benefit of all countries.
外层空间。根据1967年《外层空间条约》，任何国家都不能对月球、行星或其他天体主张主权。外层空间应为了所有国家的利益而开发和利用。
3. The Tragedy of the Commons | 公地悲剧
The concept of the tragedy of the commons was popularised by ecologist Garrett Hardin in 1968. He used the example of shared pasture land: if every herder tries to keep more animals on the common pasture, the total benefit goes to each individual, but the cost of overgrazing is shared by all. The rational decision for each person leads to a disaster for everyone.
“公地悲剧”这一概念由生态学家加勒特·哈丁于1968年提出。他以共用的牧场为例：如果每位牧民都试图在公共牧场上放养更多牲畜，个体获得全部收益，而过度放牧的代价却由所有人分担。对每个人而言合理的决策，最终会导致全体人的灾难。
This idea can be applied to the global commons. Modern and industrial users may increase their own profits from fish catches, fossil fuel use, or satellite launches, while the environmental damage is spread across all countries and future generations.
这一思想同样适用于全球公地。现代和工业使用者可以从捕鱼、化石燃料使用或航天器发射中增加自身利润，而环境损害却由所有国家及子孙后代共同承担。
4. Why Protect the Global Commons? | 为什么要保护全球公地
The global commons provide essential life-support services. They regulate the climate, recycle water, maintain biodiversity, supply food and minerals, and are valuable for scientific research. Without proper protection, human well-being and future economic development are threatened.
全球公地提供了重要的生命支持功能。它们调节气候、循环水资源、维持生物多样性、提供食物与矿物，并具有重要的科研价值。如果缺乏有效保护，人类福祉和未来经济发展都将受到威胁。
Protecting global commons also supports several United Nations Sustainable Development Goals, especially Goal 13 on climate action and Goal 14 on life below water.
保护全球公地也有助于实现多项联合国可持续发展目标，尤其是关于气候行动的第13项目标和关于海洋生物的第14项目标。
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Healthy oceans absorb about one quarter of human carbon dioxide emissions and provide habitat for many species.
健康的海洋能够吸收约四分之一的人类二氧化碳排放，并为许多物种提供栖息地。
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The atmosphere protects life from harmful ultraviolet radiation and maintains a stable temperature range.
大气层能够保护生命免受有害紫外线辐射，并维持相对稳定的温度范围。
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Antarctica stores about 70% of the world's fresh water as ice and is essential for climate research.
南极洲以冰的形式储存了全球约70%的淡水资源，对气候研究至关重要。
5. Governance and International Treaties | 治理机制与国际条约
Because no single state has authority over global commons, governments must work through international regimes. A regime is a set of principles, rules, and decision-making procedures that states agree to follow. The table below summarises key examples.
由于没有任何单一国家对全球公地拥有管辖权，各国必须通过国际体制进行合作。“体制”是指各国同意遵守的一套原则、规则和决策程序。下表总结了典型例子。
| Global common | Key treaty or regime | Main contribution |
|---|---|---|
| High seas and the Area | UNCLOS, 1982 | Defines the EEZ, high seas freedoms, and the deep seabed as common heritage of mankind. |
| Atmosphere | Montreal Protocol, 1987; UNFCCC, Paris Agreement, 2015 | Phases out ozone-depleting substances; sets global targets to reduce greenhouse gas emissions. |
| Outer space | Outer Space Treaty, 1967 | Prohibits national appropriation and weapons of mass destruction in space. |
| Antarctica | Antarctic Treaty, 1959; Madrid Protocol, 1991 | Keeps Antarctica for peace and science; protects the environment and restricts mineral exploitation. |
6. Threats to the Ocean and the Atmosphere | 海洋与大气面临的威胁
Both ocean and atmosphere are under stress from human activity. Because they are shared, damage often crosses national borders and is difficult to trace back to one source.
海洋与大气都因人类活动而承受巨大压力。由于它们是共享资源，损害往往跨越国界，并且很难追溯至单一源头。
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Overfishing and illegal fishing. The high seas are open to fishing by many nations. When fishing is not managed sustainably, fish stocks fall, and by-catch damages marine ecosystems.
过度捕捞与非法捕鱼。公海向多个国家开放捕捞。如果渔业管理不可持续，鱼类种群会下降，兼捕还会破坏海洋生态系统。
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Plastic pollution. Plastic waste accumulates in ocean gyres, breaks into microplastics, and is ingested by marine organisms.
塑料污染。塑料垃圾在海洋环流中不断堆积，分解成微塑料，并被海洋生物摄入。
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Ocean acidification and warming. When CO₂ dissolves in seawater, it lowers the pH of the ocean. Warming sea temperatures also cause coral bleaching and shift marine species distribution.
海洋酸化和变暖。二氧化碳溶解在海水中会降低海洋pH值。海洋水温上升还会造成珊瑚白化，并改变海洋物种的分布范围。
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Greenhouse gas emissions. Burning fossil fuels adds CO₂, methane, and other gases to the atmosphere, strengthening the greenhouse effect and causing global climate change.
温室气体排放。燃烧化石燃料向大气中增加二氧化碳、甲烷等气体，加剧温室效应，导致全球气候变化。
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Ozone depletion. Chlorofluorocarbons (CFCs) used in old refrigerants and aerosols destroyed ozone molecules, causing a thinner ozone layer and the Antarctic ozone hole.
臭氧消耗。旧式制冷剂和气雾剂中使用的氯氟碳化物（CFCs）会破坏臭氧分子，导致臭氧层变薄和南极臭氧洞。
7. Threats to Outer Space and Antarctica | 外层空间与南极面临的威胁
New frontiers, such as outer space and Antarctica, are increasingly under commercial and geopolitical pressure. Their remoteness no longer protects them from human damage.
外层空间与南极等新边界正日益受到商业和地缘政治压力。它们虽然遥远，却已无法避免人类活动带来的破坏。
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Space debris. There are thousands of dead satellites, spent rocket stages, and fragments orbiting the Earth. They can hit working satellites and create more debris through collisions.
太空碎片。地球轨道上存在成千上万的废弃卫星、火箭残体和碎片，它们可能撞击正在工作的卫星，并通过碰撞产生更多碎片。
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Congestion of geostationary orbit. Valuable orbital slots above the Equator are limited. More satellites mean a greater risk of interference and collision.
地球静止轨道拥挤。赤道上方的宝贵轨道位置十分有限。卫星数量越多，相互干扰和碰撞的风险就越大。
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Antarctic ice melt. Climate change is warming the Antarctic Peninsula and destabilising ice shelves, contributing to sea-level rise.
南极冰层融化。气候变化正在使南极半岛升温，并加剧冰架的不稳定性，从而导致海平面上升。
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Tourism and fishing pressure. Increased tourism and krill fishing can disturb breeding habitats and the Antarctic food web.
旅游与捕捞压力。不断增长的旅游业和磷虾捕捞会干扰动物繁殖栖息地和南极食物网。
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