"Many of the man-made ponds for storing toxic sludge from coal mining operations have dangerously weak walls because of poor construction methods, according to the synopsis of a study for the Office of Surface Mining Reclamation and Enforcement obtained by The Washington Post."

"In the months before last week's deadly fertilizer plant explosion in Texas, U.S. government watchdogs criticized federal oversight of facilities that make or store dangerous chemicals."

"Underfunded agency faces the challenge of finding answers to key questions: When did Exxon's pipeline rupture and when did the company learn of the spill?"

"State and federal  investigators on Sunday began their  first in-depth look at the cratered epicenter of a fertilizer plant explosion that killed at least 14 people, including about 10 volunteer firefighters and the residents who tried to help them extinguish a fire at the site."

"Tokyo Electric Power Co. refuses to pay 10.55 billion yen ($106 million) for decontamination work around its crippled Fukushima No. 1 nuclear plant, saying it is under no legal obligation to do so."

"TALLAHASSEE -- The state of Florida filed a lawsuit Saturday against the oil company BP and the cement contractor Halliburton over the Deepwater Horizon oil spill, becoming the fourth state to seek damages for the 2010 disaster."

"CLARKSVILLE, Mo. -- The fast-rising Mississippi River was making travel difficult Saturday, both on the river and for those simply trying to get across it."

"WASHINGTON -- Cleanup workers, doctors, divers and Gulf Coast residents interviewed by a Washington watchdog group have reported health problems from the 2010 Gulf of Mexico oil spill, including blood in the urine, heart palpitations, kidney and liver damage, migraines, memory loss and reduced IQ."

"Few Torontonians know there are oil pipelines beneath the city and that Enbridge has applied to make significant changes to one of them."

"WEST — In this small, shattered town 80 miles south of Dallas, residents awaiting word on missing loved ones spent most of Thursday finding hope in not knowing for sure.

"Record-setting rains in parts of the Midwest have caused hundreds of flight cancellations and flooding, with one northern Illinois hospital evacuating patients due to rising floodwaters."

"A massive explosion at a fertilizer plant rocked the town of West, north of Waco, causing multiple casualties and leaving people trapped and buildings on fire.

Emergency personnel were bracing for the possibility of dozens of dead in the blast, which was reported at 7:53 p.m. and could be heard 45 miles away in Waxahachie.

With a tiny budget, the U.S. Chemical Safety Board is coming under fire for slowness in completing investigations on a large number of major accidents involving chemical hazards.

"Debra White Plume and Marie Brush Breaker Randall stood in the middle of Highway 44, alongside more than 70 other members of the Oglala Lakota Nation. For hours, they didn't budge -- much to the chagrin of some tractor-trailer drivers bound for the tar sands region of Alberta, Canada."

"A BP executive testified the captain of the oil rig that exploded and sent millions of barrels of oil pouring into the Gulf of Mexico delayed activating the installation’s safety systems after the blast as a trial over the disaster ended."