QUESTION: Explain the phenomenon of El Nino-Southern Oscillation (ENSO).

Make sure to address the following topics in the blog post:
– What is El Nino -Southern Oscillation (ENSO)? 
– What causes ENSO events and How often does it occur?
– Compare and contrast El Nino and La Nina events.
– How does ENSO affect global weather and climate pattern? 
– Give examples of the effects of ENSO events on the climate of your region or community.

Write a  short blog (300-350 words).
No format.