Feast your eyes on what is clearly not the best photo ever. But, it's the content that's important.
The brown liquid in the lower left-hand corner is acid mine water. The reeds mark the aboveground portion of the Wonderfonteinspruit, a stream used by communities (not ones where politicians or CEOs live, let's put it that way) for irrigation and many other purposes. This water mixes because a dam controlling polluted runoff from mines has a crack in it.
I was tipped off by an activist who was tipped off by a whistleblower, so I investigated. I took this photo while standing on the dam wall, and it quickly became clear that the claims were valid. I then called the CEO of the company responsible -- a mine waste remining company called Mintails Mining South Africa (Pty) Ltd -- and without hesitation he admitted to knowing about the problem.
I published this information in Johannesburg's (arguably) flagship daily, and the reaction was....not really anything. So there you have it. Back to work.