"MARIANA, Brazil -- "Three days after a massive mudflow and flood caused by ruptured dams at an iron ore mine, Brazilian authorities are still struggling to determine a cause or even recover the bodies of as many as 28 people possibly swept away in the torrent."

"Casualties from a collapsed dam at a Brazilian mine owned by Vale and BHP Billiton mounted on Friday after rescue teams worked through the night to find the dozens missing in mudslides that devastated a nearby village."

"Federal authorities said on Thursday they were investigating the deaths of two California common bottlenose dolphins that stranded and died on beaches just a few miles apart in San Diego a day after the U.S. Navy conducted a brief exercise with sonar."

"U.S. EPA's science advisers are criticizing the agency's June announcement dismissing the dangers to drinking water from hydraulic fracturing."

"Only two of 10 Barataria Bay bottlenose dolphins that were found to be pregnant in 2011, a year after the BP Deepwater Horizon explosion oiled the bay, had successful pregnancies. And the survival rate through July 2015 for adult dolphins that were given health assessments in the bay in 2011 is 10 percent lower than found in two studies of dolphins in un-oiled Sarasota Bay, Fla."

"The Senate voted Tuesday to advance a measure to block the Obama administration’s new regulation asserting federal authority over small waterways." But if the measure ever reaches President Obama's desk, he is likely to veto it, and the Senate seems unable to override a veto.

"President Obama [Tuesday] ordered five federal agencies to streamline regulations for offsetting environmental harm and to promote independent mitigation efforts."

"A large ship found in deep water off the Bahamas is the lost freighter El Faro that sank with 33 crew members in a hurricane last month, U.S. authorities said on Monday."

"There's far more riding on the Americas' largest seawater desalination plant than the 50 million gallons of drinking water it will produce for the San Diego area each day."

"One of the last wild runs of chinook salmon in California is sinking fast amid the four-year drought and now appears perilously close to oblivion after the federal agency in charge of protecting marine life documented the death of millions of young fish and eggs in the Sacramento River."