Since the 1970s, temperatures at the earth's surface have warmed, Arctic sea ice has decreased in thickness, and now we know that the average temperature of the world's oceans has increased during this same time period."
(temperatures at the earth's surface; have warmed; T:Since the 1970s) (Arctic sea ice; has decreased; in thickness; T:Since the 1970s, temperatures at the earth's surface have warmed) (we; know; that the average temperature of the world's oceans has increased during this same time period; T:now) Context(we know,List([117, 124))):(the average temperature of the world's oceans; has increased; T:during this same time period)
we know,List([117, 124))
temperatures at the earth's surface Arctic sea ice we the average temperature of the world's oceans
have warmed has decreased know has increased
T:Since the 1970s
in thickness T:Since the 1970s, temperatures at the earth's surface have warmed
that the average temperature of the world's oceans has increased during this same time period T:now
T:during this same time period