If you don't really know the what "fracking" is, then before chanting along "Ban fracking, renewables now", read about the process - the benefits and negative consequences to get a better idea of the bigger picture.
A rough synopsis is that miners use water mixed with sand an a few chemicals to hydraulically force small fractures in rocks. The fractures release fuels that aren't easily mined using traditional mechanisms, but at the same time release hazardous gasses and liquids that affect the ecology. Three interesting things I learned from the Wikipedia article are:
1. Fracking can release radioactive gas! What?!
2. Fracking may be less hazardous than traditional mining. Really?!
3. Fracking may be more hazardous than what we're lead to believe. Probably.
So, as you can see from the above, I'm pretty conflicted and don't really know what to believe. For an interesting illustration of fracking dangers, take a look at www.dangersoffracking.com. It'll help to explain why fracking in an arid region like the Karoo may be a really bad idea.