Alabama used nitrogen gas Thursday to execute a man convicted of killing three people in back-to-back workplace shootings, the second time the method that has generated debate about its humaneness has ...

Anthony Boyd, 54, has been executed by nitrogen gas in Alabama for his role in the 1993 murder of Gregory Huguley, who was burned alive over a $200 cocaine debt. He was pronounced dead at 6.33pm on ...

The condemned man is challenging the use of nitrogen hypoxia gas as unconstitutionally cruel. He suggested a firing squad, hanging or medical aid-in-dying as better alternatives. A federal judge has ...

Human-caused emissions of the potent but often-overlooked greenhouse gas nitrous oxide, or laughing gas, are rising sharply and increased 40 percent over the past 40 years, according to a ...