The correct answer is - it leads to flooding and drought in different areas.
The El Nino occurrence on every 4 years has global effect on the climate, but by far the most affected is the western part of South America and also the Pacific island countries. It causes a lot of problems, flooding's caused by heavy precipitations, connected to that one of the biggest land slides on the planet, and there's always lots of casualties. In other parts is totally the opposite, it causes long drought and very high temperatures.
