Related topics: health officials

Colorado's efforts are not enough to solve its ozone problem

A year after health officials issued a record number of alerts for high ozone levels on Colorado's Front Range, federal and state officials are trying to rein in the gas that can make outdoor activities a health risk.

UN urges ambitious action to protect the oceans

World leaders must do more to protect the oceans, a major United Nations conference concluded on Friday, setting its sights on a new treaty to protect the high seas.

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