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Disadvantages of oil as a source of energy

Answer Text:
Disadvantages of oil.
(a) For countries importing oil, it is expensive to transport.
(b) Prospecting for oil is quite expensive.
(c) Oil may also affect the environment, since extracting large quantities of petroleum may cause land to sink.
(d) The oil is not readily available everywhere.
(e) It can burn easily causing fire accidents.
(f) Its exploitation demands special skills.