We knew something was wrong when algae began to coat rivers, when the smell from untreated sewage reached our communities, or when massive fishkills appeared in lakes and streams.
That means more nutrients in the soil, where it feeds food crops, and less in lakes and streams, where it feeds algae that sucks up oxygen and killsfish.
It releases a surge of warm water from the equator which kills off the plankton causing the fish which feed on them to die of starvation and driving the survivors south into Chilean waters.