How do El Niño events get started?
    What causes them to stop?
    Why are some El Niño events larger or different than other
El Niño events?
   
What makes each El Niño event's impacts different?
    What are the basic processes by which they impact
the global environment?
   
Why do La Niñas follow El Niño at some times, and not other times?
   
Why does El Niño occur at irregular intervals?
   
Does El Niño cause the climate anomalies or is it just linked to
the anomalies?
   
Is the 1976 climate jump linked to the number and intensity of El Niño
events after 1976?
    Why aren't we able to better
forecast them and their impacts?