📚 Energy Security and Supply-Demand Patterns | 能源安全与供需格局
Energy security is the uninterrupted availability of energy sources at an affordable price. Understanding how global supply meets uneven demand is essential for analysing geopolitical, economic and environmental issues.
能源安全是指以可承受的价格持续可靠地获得能源。理解全球供给如何满足不平衡的需求，是分析地缘政治、经济与环境问题的关键。
1. Concept and Dimensions of Energy Security | 能源安全的概念与维度
Energy security is often defined by four dimensions known as the '4 As': availability of physical reserves, accessibility to transport and infrastructure, affordability of prices, and acceptability of environmental and social impacts.
能源安全通常由"4A"定义：可获得性（资源的物理储量）、可获取性（运输与基础设施）、可承受性（价格）和可接受性（环境与社会影响）。
Energy Security = f(Availability, Accessibility, Affordability, Acceptability)
能源安全 = f(可获得性, 可获取性, 可承受性, 可接受性)
In A-Level geography, this framework helps classify risks: a country may have large reserves but poor access, or affordable energy but unacceptable emissions.
在A-Level地理中，该框架有助于分类风险：一个国家可能拥有大量储量但获取困难，或者能源价格低廉但排放不可接受。
2. Global Supply and Demand Pattern | 全球供需格局
Global consumption is concentrated in Asia-Pacific, North America and Europe. China, India, the United States and the EU are the largest energy consumers, while the Middle East, Russia, Australia and North America dominate production.
全球消费集中在亚太、北美和欧洲。中国、印度、美国和欧盟是最大的能源消费方，而中东、俄罗斯、澳大利亚和北美主导生产。
Table: Regional production and consumption patterns
表格：各地区生产与消费模式
| Region / 地区 | Production / 生产 | Consumption / 消费 | Net Balance / 净差额 |
| Middle East / 中东 | High / 高 | Low / 低 | Large surplus / 大量盈余 |
| China & India / 中国与印度 | Medium / 中等 | Very high / 非常高 | Deficit / 赤字 |
| Europe / 欧洲 | Low / 低 | High / 高 | Importer / 进口方 |
This mismatch creates trade flows that pass through vulnerable choke points. The Asia-Pacific region, for example, must import oil and gas across long maritime routes.
这种错位形成了经由脆弱咽喉点的贸易流。例如，亚太地区必须通过漫长的海上航线进口石油和天然气。
3. Spatial Distribution of Energy Resources | 能源资源的空间分布
Fossil fuel deposits are geologically concentrated. Approximately 45% of proven oil reserves lie in the Middle East; Russia, Iran and Qatar hold over 50% of global gas reserves; coal is abundant in China, the United States, India and Australia.
化石燃料矿藏在地质上高度集中。全球已探明石油储量约45%位于中东；俄罗斯、伊朗和卡塔尔拥有全球超过50%的天然气储量；煤炭则在中国、美国、印度和澳大利亚储量丰富。
Renewable energy potential is more widely spread but still uneven. Solar radiation is
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