From oil spills and explosions to nuclear testing fallout, these are some ecological disasters that changed our world forever.

Description: Chernobyl is a visual account of how safety lapses led to the world’s worst nuclear power accident ... to fight with heat and flames. Man-made disaster on National Geographic ...

With unprecedented access inside both Fukushima nuclear power plants, NOVA speaks with workers who were there during the harrowing days—a crisis that began as a natural a disaster but was made ...