Inert gas asphyxiation lacks oxygen and consists of an asphyxiant gas (one or more of argon, nitrogen or carbon dioxide), causing the animals to lose consciousness. Argon and nitrogen are important components of a gassing process which seem to cause no pain, and for this reason many consider some types of controlled atmosphere killing more humane than other methods of killing. However, "stunning" is often done using carbon dioxide. If carbon dioxide is used, controlled atmosphere killing is not the same as inert gas asphyxia, because carbon dioxide at high concentrations (above 5%) is not biologically inert, but rather is toxic and also
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