"WASHINGTON — If the Keystone XL pipeline is not built — and more oil from the Canadian oil sands is moved by rail — there could be hundreds more deaths and thousands more injuries than expected over the course of a decade, according to an updated State Department analysis of the contested project that was released Friday."

"A federal working group released a report Friday that details how the government can improve chemical plant safety and security, more than a year after the deadly explosion at a West, Texas, fertilizer plant."

"Design problems with a blowout prevention system contributed to the 2010 Deepwater Horizon oil rig disaster, and the same equipment is still commonly used in drilling four years after the Gulf of Mexico oil spill, according to a report issued by the federal Chemical Safety and Hazard Investigation Board."

"A new study suggests steelhead trout can have trouble using the Earth’s magnetic field to navigate if they were raised in a hatchery, where the field can be distorted by iron pipes."

Colorado's experience may prove that EPA's new carbon rule is survivable.

"President Barack Obama’s plan to fight global warming underestimates pollution from natural gas, according to scientists studying how leaks affect the climate."

"It’s called chikungunya virus, and it’s already here in the United States, with 28 cases brought into parts of the country by travelers from 17 countries, mainly in the Caribbean, where more than 103,000 people have been afflicted by the debilitating virus, the Centers for Disease Control and Prevention reported Thursday."

"Federal safety regulators warned on Thursday that another disastrous offshore oil well blowout could happen despite regulatory improvements in the four years since a BP well explosion in the Gulf of Mexico killed 11 workers and dumped millions of gallons of oil into the sea."