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We all need food and water to survive.
我们都需要食物和水才能生存。
You've seen how invisible bacteria can make food inedible, but seemingly clean water can be dangerous too.
你已经了解到看不见的细菌是如何使食物变得无法食用，表面上干净的水也可能是危险的。
Water pollution is a growing problem that could seriously affect your health.
水污染是一个日益严重的问题，可能严重影响你的健康。
How does water pollution affect you?
水污染对你有什么影响？
Near the beach house and there's a lot of times like stuff washes up on the beach and just stuff people throw away.
在海滩小屋附近，很多时候像会有东西冲到海滩上，这些都是被人们扔掉的。
I went to Mexico and you could only drink bottled water because of water pollution.
我去墨西哥时，因为水污染，只能喝瓶装水。
Water pollution affects me because I can't kayak in polluted water.
水污染影响了我，因为我不能在污染的水里划独木舟。
Three-fourths of the earth's surface is covered by water.
地球表面的四分之三被水覆盖。
With so much water, it's hard to believe people could have much of an effect on such a seemingly limitless resource.
这么多的水，很难相信人们会对这样一个看似无限的资源产生多大的影响。
But water is not limitless and with every passing day, our water system is becoming more and more polluted.
但是水并不是无限的，随着时间的推移，我们的水系统越来越受到污染。
When you think about pollution, you probably think about air pollution caused by cars and factories.
考虑到污染时，你可能会想到汽车和工厂造成的空气污染。
But another kind of pollution may be more dangerous to our survival.
但是另一种污染对我们的生存可能更危险。
Water pollution.
水污染。
What is water pollution?
什么是水污染？
Water pollution is any change to water that has a harmful effect on people or other living things.
水污染是指对人或其他生物产生有害影响的，有关水的任何变化。
Humans cause most pollution.
人类造成了大部分污染。
Many of our activities, agriculture, industry construction and mining produce wastes that can end up in water.
我们的许多活动，农业，工业建筑和采矿产生的废物最终会进入水中。
Everything we make eventually gets thrown away.
我们制造的一切最终都会被扔掉。
What we throw away ends up in landfills and everything that ends up in a landfill eventually leeches into the ground.
我们扔掉的东西最终会进入垃圾填埋场，这些废物最终都会埋入土地。
These materials can enter the ground water and make their way into the ocean.
这些物质可以进入地下水源中，然后进入海洋。
This is a mountain of garbage from New York City 150 feet high.
这是纽约市150英尺高的垃圾堆。
It is already the largest trash pile in the history of the human species.
它已经成为人类历史上最大的垃圾堆。
It's located on a small island off the coast of Maine.
它位于缅因州海岸的一个小岛上。
Many products are made of synthetic molecules that never existed in nature before we created them.
许多产品由合成分子制成，在我们创造出它们之前，这些分子在自然界中从未存在过。
And many are dangerous to plants and animals.
许多对动植物都是危险的。
Even things like sun blocks that wash off our bodies at the beach can kill microorganisms in the water and disrupt the food chain.
即使像在海滩时，从我们身体上冲走的防晒霜这样的东西，也能杀死水中的微生物，破坏食物链。
