Amorphous Silicon Collectors Are Currently Being Used in

Q29: Ocean thermal electric conversion systems would operate

Q30: Ocean thermal electric conversion (OTEC) uses _

Q31: Photovoltaic electricity costs are _ coal or

Q32: The most serious drawback to fuel cells

Q33: Improving standards of living have been repeatedly

Q35: Some highly efficient turbines can be submerged

Q36: Improved insulation, energy efficient windows and curtains,

Q37: Very few living trees are cut down

Q38: Most of North America's wind potential is

Q39: Siltation and decreased water quality are especially