Shared bikes can help people travel around freely in cities without pollution.

共享自行车可以帮助人们在城市中自由出行，不会产生污染。

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It's easy to see why: nuclear fusion powers the sun, and it holds out the possibility of near-limitless electricity, without pollution.

很容易知道原因：核聚变为太阳提供能量，也为一种近乎无限的无污染的电提供了可能。

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The word of the day, without pollution.

天之道，利而不害。

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Pedal People in Northampton, Massachusetts,has found an inventive way of transporting goods and services without creating pollution.

VOA: special.2009.12.04

Building a third runway at Heathrow would not be possible in the near future without breaching EU pollution rules, according to the reports.

CNN: UK's Stansted expansion challenged

Imagine Shanghai crabs being caught in American ponds, lakes, and rivers, without pesticides and industrial pollution, and exported to China.

FORBES: A New World of Exports to China

The robot is powered entirely by solar energy, so it can operate in pristine polar environments without adding to air pollution.

ENGADGET: NASA's GROVER eco-rover to examine Greenland's ice sheet (video)