SOUTH AFRICA. Johannesburg. Joubert Park. A local invention, the smokeless cooker, is demonstrated at Joubert Park greenhouse project, central Johannesburg. Thousands of cookers, in single barrels, using sulphurous coal, belch smoke in the townships, causing severe respiratory illnesses. This double barrel type burns the smoke, uses 20% less fuel, and is better both for people's health and the environment. 2004.