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What's the hidden environmental cost of an ordinary cotton T-shirt?
一件普通棉质T恤背后隐藏着怎样的环境代价？
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Cotton is a thirsty crop grown across vast agricultural fields worldwide.
棉花是一种极度耗水的经济作物，遍布全球大片农田。
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Producing a single cotton T-shirt requires approximately 2,700 liters of water.
生产仅仅一件纯棉T恤就需要消耗约 2,700 升淡水。
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That is enough fresh drinking water to sustain an adult human for 900 days!
这相当于一个成年人整整 900 天的正常饮用水总量！
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The lifecycle impacts don't stop with farming; washing and care consume massive resources.
棉织品的影响不仅限于种植加工，日常洗护同样消耗巨量资源。
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A single standard machine wash cycle expends around 40 gallons of clean water.
一次标准的洗衣机洗涤程序就会耗费大约 40 加仑干净水。
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Drying clothes with heat consumes five times more electricity and energy than washing.
使用烘干机加热烘干衣物所耗费的电能是洗涤过程的 5 倍之多。
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By choosing to air-dry naturally and avoid ironing, you cut 1/3 of the clothing's carbon footprint.
通过选择自然风干并免去熨烫，你就能减少这件衣物 1/3 的碳足迹。
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Small sustainable daily habits empower global water conservation for future generations.
从日常微小环保习惯做起，让我们共同守护地球宝贵的淡水资源。
视频理解与水足迹测算 (Video Comprehension)
严格对应教材 Page 201–202 官方练习：Before You Watch 与 While You Watch 棉织品水能耗生态数据核算。
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Discussion (p.201) What are the advantages of cotton fabric?
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Predicting (p.201) In what ways does cotton clothing production impact the global environment?
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Data Completion (p.202) Making one cotton T-shirt requires ______ liters of water.
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Data Completion (p.202) This is enough drinking water for one person for ______ days.
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Data Completion (p.202) One load of drying uses ______ times more energy than washing.
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Data Completion (p.202) One standard load of washing uses ______ gallons of water.
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Data Completion (p.202) Air-drying and avoiding ironing can save ______ of a T-shirt's carbon footprint.
Critical Thinking · Solving Urban Water Crises
If your city faces severe water shortages, what decisive actions should be enacted by (a) municipal governments (e.g. bans, leak repairs), and (b) individual families (e.g. rain barrels, short showers)?