Are we not interested in renewable energy?

Arguably, the local pollution caused by coal burning will not be too severe. It could be minimised - even avoided - if Botswana and South Africa also made greater use of renewable energy available from wind and sunlight, and less from burning coal. There is arguably a need for both, however.

Wind and sunlight can arguably generate power, either on a relatively inexpensive, small scale, in widely dispersed, smaller and medium, population centres, as well as on a larger scale for bigger population centres, as has been done in several countries on different continents.