One major reason for the lack of development in oceanic energy sources is ________.
(a) The potential substantial negative impact on marine and estuarine ecosystems
(b) The lack of funding
(c) That oceanic processes are not completely understood
(d) The lack of technological advancement
(e) The lack of political support
Answer: (a)

The largest problem with adopting the new technology of renewable resources is ________.
(a) in evaluating the scientific and economic impacts
(b) that the startup costs are high
(c) that long term maintenance costs are higher than those for fossil fuels
(d) that technological advances have not been made in the last 30 years to meet our energy needs
(e) that energy production facilities are not located near consumers
Answer: (b)

Although solar-PV-generated electricity as a power source is cleaner than burning fossil fuels, the problem with this electricity is that it ________.
(a) is dangerous if stored too long
(b) cannot be stored easily in large quantities for use when and where it is needed
(c) is not sufficiently understood
(d) will be replaced shortly with other sources of power for homes
(e) is less efficient than fossil fuels
Answer: (b)

One difficulty with the process of using hydrogen as a power source is that it ________.
(a) is not properly understood
(b) is less efficient than fossil fuels
(c) requires a fuel that is a nonrenewable resource
(d) requires an energy investment to begin the process
(e) has highly volatile and dangerous components
Answer: (d)