Inert gas In food packaging, inert gases are used as a passive preservative, in contrast to active preservatives like sodium benzoate (an antimicrobial) or BHT (an antioxidant). Historical documents may also be stored under an inert gas to avoid degradation. For example, the original documents of the U.S. Constitution is stored under humidified argon. Helium was previously used, but it was less suitable because it diffuses out of the case more quickly than argon. Inert gases are often used in the chemical industry. In a chemical manufacturing plant, reactions can be conducted under inert gas to minimize fire hazards or unwanted reactions.
Phase-out of incandescent light bulbs have had exchange programs to replace incandescent bulbs with energy efficient versions. Ghana banned incandescent bulbs in 2008 and Senegal has banned the manufacture and import. Egypt is reported to have a partial ban on incandescent light bulbs. Kenya has a programme to exchange a number of light bulbs with more efficient types. Morocco has a programme to exchange a number of light bulbs with more efficient types. Namibia has an exchange program which distributed 1 million energy saving bulbs in 2016. Rwanda has an exchange program, distributing CFL bulbs. South Africa phased out incandescent light bulbs in 2016. Tanzania