The Sun, of course, the light it emits is what heats up the Earth (we already knew that light carries energy).
(the light; emits; it) (the light it emits; is; what heats up the Earth (we already knew that light carries energy) (we; knew; that light carries energy; T:already) Context(we knew,List([67, 82))):(light; carries; energy)
we knew,List([67, 82))
the light the light it emits we light
emits is knew carries
it
what heats up the Earth (we already knew that light carries energy
that light carries energy T:already
energy