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As climate change warms ocean waters, they may become depleted of dissolved oxygen, with profound consequences for the ecosystems.

"Rangers at southern Utah's Arches National Park were investigating large graffiti Thursday that was carved so deeply into a famous redrock arch that it might be impossible to erase, officials said."

"For the second straight day, Senate Democrats blocked consideration of an energy and water spending package due to a proposed amendment dealing with the Iran nuclear agreement."

"Indian villagers have found a way to bottle the fragrance of monsoons."

"Colorado, which gets 60 percent of its electricity from coal-burning power plants, has set some of the more ambitious greenhouse gas reduction targets in the United States. It wants to cut emissions from its power plants 38 percent by 2030. ... One of the immediate problems of the target-setters, however, is that the state lacks plans from its fastest-growing, most energy-hungry users: owners of indoor marijuana farms."

"An intense last-minute push by establishment Democrats and environmentalists to shore up their preferred Senate Democratic nominee paid off in Pennsylvania [Tuesday] night, as former White House Council on Environmental Quality Chairwoman Katie McGinty won the right to take on Republican Sen. Pat Toomey in November."

"Hundreds of industrial facilities across Texas are illegally spewing millions of pounds of toxic pollutants into the air each year when they break down or perform maintenance, and state environmental regulators are not adequately policing the rogue emissions, according to a new report."

"Brine spills from oil development in western North Dakota are releasing toxins into soils and waterways, sometimes at levels exceeding federal water quality standards, scientists reported Wednesday."

"The Canadian affiliate of ExxonMobil, the world’s largest publicly traded multinational oil and gas corporation, has known for decades that its operations were causing environmental damage and contributing to climate change, according to newly-released documents from a Calgary museum."

"The armed occupation of the Malheur National Wildlife Refuge which ended in February has left an unexpected legacy to the park, one that appears to be in conflict with the occupiers' original intent. Since the siege on the refuge ended in early February, the park has seen a surge of financial support."