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Pollution

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aviation fire

TOXIC FOAM  The foam used to put out aviation fires often contains toxic perfluorooctanoic acid and related molecules. When these chemicals get into the water supply, they linger for years without breaking down. A new material may offer a better way to filter them out.

President Trump announcing withdrawal from Paris climate accord

CLIMATE CONTROL President Donald Trump announced June 1 that the United States will leave the Paris climate accord, calling it “simply the latest example of Washington entering into an agreement that disadvantages the United States.”

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.

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