Discuss three reasons why south africa must include renewable energy in its
energy mix

Well, Africa is a continent that is very rich in terms of resources, and is readily developing as a nation. One reason would that solar energy would be one of the main sources because of its open land, second, the available waters fr hydroelectric and wind. And lastly, the nation is still coming of age, where many ideas could still be implemented in the region such as renewable energy. 

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This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.