New Scientist is featuring this article detailing recent discoveries about hydrogen sulfide eruptions off the coast of Namibia, Africa. Turns out their much larger than previously thought, and has been blamed for killing a billion fish with one eruption.

Sorta reminds me of when Mt. Pinatubo erupted back in the 90s. Scientists (as I recall) discovered that one eruption dumped more greenhouse gasses into the atmosphere than what man had generated in the past century.