Thus far, the quest for renewable energy has focused on the earth's crust -- Geothermal Energy -- the sun's rays -- Solar Energy -- and the atmosphere's winds -- Wind Energy .
(the quest for renewable energy; has focused; on the earth's crust -- Geothermal Energy -- the sun's rays -- Solar Energy -- and the atmosphere's winds; T:Thus far)
the quest for renewable energy
has focused
on the earth's crust -- Geothermal Energy -- the sun's rays -- Solar Energy -- and the atmosphere's winds T:Thus far