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Biomass was rising a decade ago as a carbon-neutral energy. But the industry is sputtering as oil and natural gas booms, and some scientists are questioning if it's actually good for the environment.

Two freight trains collided in Texas after one ran a stop signal, the National Transportation Safety Board says. Three people died. The section of track did not have Positive Train Control installed.

"The findings of the report show a shocking and unprecedented attack on the integrity of sport and on the Olympic Games," IOC President Thomas Bach says of a WADA investigation.

Perdue Farms, one of the largest poultry companies in the country, says it will change its slaughter methods and also some of its poultry houses. Animal welfare groups are cheering.

People drove from across the country to Cleveland to hawk their wares to the throngs who've come to the Republican National Convention.

"Our party now has a nominee," Cruz said. As if on cue, the billionaire businessman's plane emblazoned with "TRUMP" across the side flew overhead to land nearby.

El Nino ruined this spring's harvest. Can food aid — and maize seeds — be delivered in time?

The Paralympic Committee said it's investigating 35 "disappearing positive samples" among disabled Russian athletes. The committee plans to announce by Aug. 1 whether it will ban Russia.

The furniture company began offering free wall-anchoring kits for tall dressers last year after two children died in accidents. Now, following a third death, it is recalling the dressers altogether.

They also say they'll grant amnesty to fighters who lay down their weapons. But big questions remain. One civilian resident told NPR he tried to use one of the corridors but feared ongoing shelling.