Three people died from apparent carbon monoxide poisoning at Saguaro Lake in Mesa on Jan. 18, a poison that kills hundreds ...

Atmospheric scientists show proposed 'geoengineering' effort to remove methane, a potent greenhouse gas, from the atmosphere could worse air quality while providing minimal climate benefits.

Carbon monoxide (CO) is an odorless, colorless gas that kills without warning. Hundreds of people die each year and thousands ...