Oil prices, notoriously vulnerable to political events, spiked as high as $40 a barrel during the Gulf War in 1991.
Oil will become less popular than the other fossil fuels.
( z1 become :ARG1 ( z2 oil ) :ARG2 ( z3 have-degree :ARG1 z2 :ARG2 ( z4 popular :ARG1 z2 ) :ARG3 ( z5 less ) :ARG4 ( z6 fuel :mod ( z7 fossil ) :mod ( z8 other ) ) ) )