"WACO, Texas — Federal agents and the state fire marshal have effectively barred a federal safety panel from the site of a Texas fertilizer plant blast that killed 15 people and injured about 200 others, hampering its investigation, the panel's chairman said."

"LONDON — More than a decade ago, British parents refused to give measles shots to at least a million children because of now discredited research that linked the vaccine to autism. Now, health officials are scrambling to catch up and stop a growing epidemic of the contagious disease."

"You might think that everything would have changed for the chemicals industry on April 16, 1947. That was the day of the Texas City Disaster, the worst industrial accident in U.S. history. A ship loaded with ammonium nitrate — the same chemical that appears to have caused the disaster last month in West, Texas — exploded. The ship sparked a chain reaction of blasts at chemical facilities onshore, creating what a newsreel at the time called "a holocaust that baffles description."

"WINDSOR, Ontario — Assumption Park gives residents of this city lovely views of the Ambassador Bridge and the Detroit skyline. Lately they’ve been treated to another sight: a three-story pile of petroleum coke covering an entire city block on the other side of the Detroit River."

"Elders and chiefs of at least 10 sovereign nations walked out of a meeting with U.S. State Department officials in Rapid City, South Dakota, on Thursday May 16 in which the government was attempting to engage in tribal consultation over the Keystone XL pipeline."

"JACKSONVILLE, N.C. -- As she flipped through the cemetery register, Mary Blakely's eyes filled with tears. On line after line, the entry read simply 'Baby Boy' or 'Baby Girl,' followed by a surname and a burial date."

"The Energy Department (DOE) on Friday approved a controversial application allowing liquefied natural-gas exports to nations that lack a free-trade agreement with the United States."

"This isn’t the first time the agency has investigated political groups – just the first time it’s become a full-blown controversy."

"Hundreds of people took to the streets of the southwestern Chinese city of Kunming on Thursday to protest against the planned production of a chemical at a refinery, the second demonstration this month against the project."

"With a barrage of legal briefs, a coalition of business groups and Republican-leaning states are taking their fight against Obama administration climate change regulations to the U.S. Supreme Court."