Prolonged exposure to UV-B light can cause sunburn, and there are worries that damage to the ozone layer may lead to an increase in the incidence of skin cancer.
Prolonged exposure to UV-B rays can cause skin cancer unless there is shade.
( z1 possible :ARG1 ( z2 cause :ARG0 ( z3 expose :ARG2 ( z4 ray :mod ( z5 ultraviolet-B ) ) :ARG1-of ( z6 long ) ) :ARG1 ( z7 disease :name ( z8 name :op "skin" :op "cancer" ) ) ) :condition ( z9 shade :polarity - ) )