Premise: The association of a monetary value with reduced emissions encourages  in the 1990's, scrubber costs decreased by approximately 40% and scrubber sulfur removal efficiencies improved from 90% to 95%, and experimentation led to the blending of fuels to lower emissions.

Hypothesis: In the 1990's they were able to reduce emissions and also try out new ways of using fossil fuels to create less emissions.
Relation: entailment