👣 碳足迹：你留下的“碳脚印”👣 Carbon Footprint: The “Carbon Feet” You Leave

上一片里，碳在大自然中转圈旅行。这一片跟着蓝色星球向导小蓝，算一算人一年留下多少“碳脚印”。 Last leaf, carbon toured nature in a circle. Now follow blue-planet guide Little Blue and count the “carbon feet” one person leaves in a year.

第 1 步：碳足迹是什么Step 1: What is a footprint

先弄清定义：什么算进你的碳足迹？First the definition: what counts toward your footprint?

个人碳足迹构成饼：出行、饮食、用电 — 碳足迹就是一个人或一件产品，从出生到退休排出的全部碳。开车、吃肉、开灯、收快递，每一件都在加分。小蓝的饼图里，出行最大块，饮食第二，用电第三。 A footprint is all the carbon one person or product lets out, from birth to retirement. Driving, meat, lights, parcels — each adds points. On Little Blue's pie, travel is the biggest slice, then food, then power.

饼里最大的是出行：同样出门，差别有多大？Travel is the biggest slice — how big can the gap be on the same trip?

第 2 步：出行是大户Step 2: Travel is the giant

高铁 vs 飞机：同段路排放对比 — 同一段路，飞机撒下大串黑脚印，高铁只有两朵小灰花。中国人均一年约 7 吨，出行就占近一半。短途多坐高铁，脚印立刻变轻。 For the same trip, the airplane stamps big dark feet while the train leaves two small puffs. Each person in China averages about 7 tonnes a year, travel nearly half. Take the train for short trips and the footprint shrinks at once.

出行搞明白了，买东西时怎么选？看标签。Travel sorted — but how do we choose at the shops? Read the label.

第 3 步：看碳标签，减排先找大户Step 3: Read the label, cut the biggest first

碳标签商品：牛奶、衣服、快递箱 — 牛奶、衣服、快递箱都贴上了碳标签，数字越小越低碳。减排就三招：出行多坐高铁，饮食少点大肉，用电随手关灯。自带杯和布袋，一年也能省下不少碳。 Milk, shirts and parcels now wear carbon labels — smaller number, lighter footprint. Three moves cut it down: ride rail, eat less meat, switch lights off. An own cup and cloth bag save plenty in a year too.

🎮 你来当记账员（30 秒）🎮 Your turn: footprint accountant (30 seconds)

道理讲完了。先勾选习惯算出一年几吨，再连过 4 关，揪出排放大户。Theory done. First tick habits to count the yearly tonnes, then clear 4 rounds and catch the biggest emitters.

一句话记住它：碳足迹 = 人或产品一生的碳排放；中国人均约 7 吨，出行是大头，减排先找大户。 Remember it in one line: a footprint = a life's carbon; about 7 tonnes per person in China, travel leads, cut the biggest first.

定义：一个人或一件产品全生命周期的碳排放Meaning: one person or product's lifetime carbon emissions 大户：出行最大（飞机远超高铁），其次饮食、用电Giants: travel first (flying beats rail by far), then food and power 行动：看碳标签；高铁、多菜、随手关灯、自带杯Moves: read carbon labels; rail, more veggies, lights off, own cup

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内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。 Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.