Oil prices, notoriously vulnerable to political events, spiked as high as $40 a barrel during the Gulf War in 1991.
Oil prices will decrease as alternative energy becomes more popular.
( z1 decrease :ARG1 ( z2 thing :ARG2-of ( z3 price :ARG1 ( z4 oil ) ) ) :time ( z5 become :ARG1 ( z6 energy :mod ( z7 alternative ) ) :ARG2 ( z8 popular :ARG2-of ( z9 have-degree :ARG1 z6 :ARG3 ( z10 more ) ) ) ) )