These changes in air pressure and wind speed cause<span> warm surface water to move eastward along the Equator, from the western Pacific to the coast of northern </span>South America<span>. </span>
Water heat at a different rate than land because water has a higher capacity for storing heat than does land surfaces.Hope this helps !
Although global human impact (global warming) is not to be ignored, this is mainly because of the El Nino in the <span>central and eastern equatorial Pacific Ocean.
If you're in the Eastern USA, its messing with the jet stream the high/low pressure ridges, causing the cold front to not be within the Northeastern USA area this year.
If you're in other areas far enough I don't know, global warming?
</span>
One effect that plentiful harvests had on ancient civilizations of the mainland's river valleys was to help have larger populations and the need to have materials to survive.