"Diet and exercise are seen as the key factors that cause obesity, but new research suggests that certain chemicals called obesogens contribute to the global weight problem. Bruce Blumberg, professor of developmental and cell biology at the University of California at Irvine tells host Steve Curwood that the effects of an obesogenic chemical he studied seem to persist for several generations."

"GENEVA -- A new and legally binding international treaty to reduce harmful emissions of mercury was adopted Saturday by more than 140 nations, capping four years of difficult negotiations but stopping short of some of the tougher measures that proponents had envisioned."

"Crisis-weary developed countries' reluctance to help finance a ground-breaking international treaty to rein in the use of health-hazardous mercury is threatening the accord, UN officials warned Thursday."

"Opponents of the Keystone XL pipeline and the heavy Canadian crude oil that it would carry released two reports on Thursday asserting that the environmental impacts of the project are worse than previously estimated, and urged the Obama administration to veto it."

"A new method for monitoring the decline in bee populations may prove a useful tool in much-needed conservation efforts. It requires only a few hundred pan traps: bright shallow bowls partly filled with soapy water or propylene glycol."

"A carcinogenic mold, its growth exacerbated by the warming climate, reached record highs in 2012."

"Leaked documents reveal the government has sought to change proposals that could prevent deepsea drilling operations."

"NASA and NOAA scientists say 2012 global temperature records further consolidate a pattern of global warming."

"Black carbon, the soot produced by burning fossil fuels and biomass, is a more potent atmospheric pollutant than previously thought, according to a four-year international study released on Tuesday."

"GENEVA — Delegates from more than 130 nations began a final round of negotiations on Sunday that are expected to lead to the creation of the first legally binding international treaty to reduce mercury emissions."