It is set on a future earth where the polar ice caps have melted covering a large portion of the Earth with water.
(It; is set; on a future earth) (the polar ice caps; have melted; L:a future earth) Context(the polar ice caps have melted,List([34, 64))):(the polar ice caps; have melted covering; a large portion of the Earth; with water)
the polar ice caps have melted,List([34, 64))
It the polar ice caps the polar ice caps
is set have melted have melted covering
on a future earth
L:a future earth
a large portion of the Earth with water