"Four new substances have been added to a list of chemicals that may cause cancer compiled by the U.S. Department of Health and Human Services (HHS)."

"The amount of antibiotics sold for use in livestock rose substantially in recent years, according to the Food and Drug Administration, a pattern that experts said was troubling given the efforts to battle antibiotic resistance in humans."

"MEXICO CITY — Deforestation is down in the Mexican forest that is the winter home of Monarch butterflies, and scientists also hope to see a rebound in the annual migration after it fell to historic lows last year, an expert said Thursday."

"The U.S. Energy Department expects to resume operations at its shuttered nuclear waste dump in New Mexico by early 2016, about two years after two serious accidents released radioactive materials and soot throughout the 2,150-foot-deep repository."

"A 20-year ban on uranium mining near the Grand Canyon will remain in place after the U.S. District Court in Arizona ruled Tuesday against mining groups that sued the federal government."

"The federal agency tasked with regulating the safety of offshore oil-and-gas drilling does not consistently enforce rules for permit review on its regional offices, according to the Interior Department’s Office of Inspector General (OIG)."

"The Environmental Protection Agency is aiming to issue by May 2015 drinking water health advisories for cyanobacteria, the harmful forms of blue-green algae that contaminated water supplies in Toledo, Ohio, and resulted in a weekend-long ban in early August, an agency official said Sept. 29."

"Starting [Wednesday], Baker Hughes Inc., a major provider of hydraulic fracturing services, says it will disclose all the chemicals it uses in fracking fluid and will no longer withhold ingredients as trade secrets."

"In July, the transportation department proposed that older cars be retrofitted within two years""