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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In the future, we can use the car without pollution.

在未来我们可以使用汽车，而不用但有污染空气。

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To reduce pollution, people have manufactured many cars without pollution.

人们还可以谴出许多没有任何污染的车。

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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)