What are trade winds?-
Global winds near the poles.
Global winds near trading posts.
Global winds near the equator.

	How can trade winds affect global weather?
A reverse in trade winds can create El Nino effects.
They don’t.
An increase in trade winds can create La Nina effects.

	How do scientists predict possible El Ninos?
Tracking changes in global sea temperatures.
Research programs like Quikscat and the Topex/Poseidon mission.
All of the above.