As I write this, raw sewage is still pouring into the Firth of Forth, the largest river near Edinburgh. The Seafield Sewage works have developed a fault, which was not exactly unexpected, campaigners have been demanding the works' improvement for years. The Firth of Forth is an important area for several species of breeding seabirds and also passes by several favourite coastal walks and residential and business areas. The problem should be fixed in the next day or so, but that's not really soon enough.
More information here.