Tsunami occurred in Indonesia and killed thousands of people.         

(from Wikipedia)

A tsunami is a series of waves when a body of water, such as an ocean is rapidly displaced on a massive scale. Earthquakes, volcanic eruptions and other underwater explosions happen as well during the tsunami. The effects of a tsunami can be much more horrible than we probably think. The sudden changes of climate mainly caused the tsunami. Because of the global warming, about 5°c rose in the whole world and this kind of things are happening more and more.