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An environmental engineer who mapped microplastic pollution in three of Pennsylvania's watersheds explains what it means for our health.

So far, about 10% of the ocean has formal protection as countries work toward the 30x30 goal, but many areas are still protected on paper only.

The constant noise of traffic is so ubiquitous, it is barely noticeable to our ears - until we step into a roadless forest and experience true quiet.

As sea ice melts, more of the Arctic Ocean opens up. A former ambassador explains how this treaty creates time for scientists to figure out what lives there.

Permanently installing a heat pump system in a building is expensive. But new window units can deliver many of the benefits with far less cost and go with renters when they move.