At night, it filters CO2 from the air—similar to how a sponge soaks up water, according to the researchers. During the day, sunlight heats up the collected CO2, which absorbs the Sun’s ...

The CO2 cartridge can be unintentionally ejected with force from the handle, posing an impact hazard. This recall involves the T4E (Training for Engagement) TR50 Air Pistol. It is CO2 powered, holds ...