Initially it was a mystery, but studies since the mid-1960s indicate that increased sea-water temperatures caused by global warming may be one factor.
(it; was; a mystery; T:Initially) (increased sea-water temperatures; caused; by global warming) (studies since the mid-1960s; indicate; that increased sea-water temperatures caused by global warming may be one factor) Context(studies since the mid-1960 s indicate,List([32, 68))):(increased sea-water temperatures caused by global warming; may be; one factor)
studies since the mid-1960 s indicate,List([32, 68))
it increased sea-water temperatures studies since the mid-1960s increased sea-water temperatures caused by global warming
was caused indicate may be
a mystery T:Initially
by global warming
that increased sea-water temperatures caused by global warming may be one factor
one factor