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Pollution

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Trees in Berlin

FEELING THE HEAT  Tree-lined streets in Berlin, shown, offer a lot of benefits for city residents. But during heat waves, the trees, along with other plants, can also contribute to poor air quality, a new study suggests.

Alcatraz Island

NOISE POLLUTION Alcatraz Island is a former prison now managed by the federal government as a protected natural area and historical site. Long-term audio recordings taken in places like this one are helping scientists understand just how much human noise affects natural places.

Scott Jasechko

DEEP WATER  Deep groundwater wells, such as this hand-pumped well in Uganda being operated by water resources scientist Scott Jasechko, can contain mixes of old and young water and traces of pollution.

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