Oil prices, notoriously vulnerable to political events, spiked as high as $40 a barrel during the Gulf War in 1991.
The Gulf War did not see the rise in prices a natural resource
The gulf war DID see a rise in prices ("spike") of a natural resource (oil), according to the text
( z1 see :polarity - :ARG0 ( z2 war :name ( z3 name :op "Gulf" :op "War" ) ) :ARG1 ( z4 resource :ARG1-of ( z5 natural ) :domain ( z6 rise :ARG1 ( z7 price ) ) ) )