Kenyans ill in 'toxic waste' leak

"Hundreds of people near the Kenyan port of Mombasa say they have become ill after a consignment of leaking chemical containers was dumped nearby... Nassir Rashid, the director of environment at the Mombasa Municipal Council (MMC), says... more than 1,500 villagers have been treated for various illnesses caused by the chemicals."

ARTICLE: BBC: http://news.bbc.co.uk/2/hi/africa/7293657.stm

Chernobyl

"The resulting run-away nuclear reaction, fire and explosion released more than 400-fold the amount of radiation from the Hiroshima bomb, hitting Belarus hardest and extending as far as Ireland. A total of 56 deaths and over 4,000 cancer cases are attributed directly to the accident."

http://www.treehugger.com/files/2009/10/8-worst-man-made-environmental-disasters.php