In order to prevent catastrophic global warming we need to keep the earth's fossil fuels underground and ensure that they are never used.
(we; need; to keep the earth's fossil fuels underground and ensure that they are never used) Context(we need,List([48, 55))):(we; need to keep underground; the earth's fossil fuels) Context(we need,List([48, 55))):(we; need to ensure; that they are never used) Context(we need to ensure,List([48, 111))):(they; are never used; )
we need,List([48, 55)) we need,List([48, 55)) we need to ensure,List([48, 111))
we we we they
need need to keep underground need to ensure are never used
to keep the earth's fossil fuels underground and ensure that they are never used
the earth's fossil fuels
that they are never used