Justin Herron: The Alaskan Exxon [Valdez] oil spill.
Fabian Janka: The Fukushima reactor explosion after the last tsunami in Japan. And although it's not fully man-made, it was a structure built by man, and when you build something like that you need to take natural events into account, and a tsunami is a common occurrence in Japan.
Constanze Brand: The first thing I thought of was Chernobyl, or just any kind of atomic disaster. 'Cause it's definitely man-made, any kind of atomic bomb or reactor, and it still effects people now even though it was years ago.