Text: But gas prices begin to rise which allows coal to make a modest comeback with respect to scenario A. This is especially true as cleaner and more efficient coal technologies begin to penetrate the market as assumed in scenarios B through D. In order to offset the tendency for coal-generated emissions to increase, permit prices need to adjust upward.
Entailment: Gas prices go up and affect coal prices.
Contradiction: Gas prices go up and have no effect on coal prices.