Why are we so worried about increasing carbon dioxide than an el niño event is under way?
carbon dioxide is a greenhouse gas that traps the heat coming from solar radiation in the atmosphere. Increasing carbon dioxide will worsen the greenhouse effect that would lead to global warming and climate change.
El niño is only temporary climate problem and it even increased the amount of carbon dioxide in the atmosphere since people will even use more air conditioner to cool themselves.
Hope it helps...=)