"The head of the Environmental Protection Agency is urging officials in Michigan to address 'systemic issues' that could prevent Flint from providing clean, safe drinking water to the city’s residents over the long term."

"When beavers build dams, they create reservoirs that store water and replenish groundwater supplies."

"President Obama may have chosen to locate his library in his adopted home state of Illinois, but a new move by Sen. Brian Schatz (D-Hawaii) suggests he may leave his biggest environmental footprint in his home state of Hawaii."

"In Sanders, Arizona, residents drank uranium-contaminated water for years."

"State officials say the latest round of sampling in Flint provides more evidence that the water quality is improving in the city’s troubled pipeline system."

"The National Oceanic and Atmospheric Administration forecasts that the dead zone in the Gulf, an area incapable of supporting marine life, will be much the same size it's been for the past several years."

"IMPERIAL COUNTY, Calif. -- The Salton Sea has gone from a midcentury vacation spot for movie stars to a post-apocalyptic desert with mounds of dead fish here, gurgling 'mud pots' there, blasts from a military bombing range on the horizon and sulfuric stench everywhere."

"Arctic sea ice shrank to its lowest level in 38 years last month, setting a record low for the month of May and setting up conditions for what could become the smallest Arctic ice extent in history, according to National Snow and Ice Data Center data released Tuesday."

"Coral reefs have almost always been studied up close, by scientists in the water looking at small portions of larger reefs to gather data and knowledge about the larger ecosystems. But NASA's Jet Propulsion Laboratory is taking a step back and getting a wider view, from about 23,000 feet above."

"Low-elevation snowpack across the Rocky Mountains, the Sierra Nevada and the Cascades will disappear in the coming decades if global warming continues unabated, according to a new study. The changes will cause water shortages in the region and dry out forests and grasslands, the study's authors say."