<prompt> Translate the following text to EnglishKatika miaka ya 1990, gharama za scrubber zilipungua kwa karibu 40 na ufanisi wa kuondoa sulfuri ya scrubber uliboreshwa kutoka 90 hadi 95, na majaribio yaliongoza kwenye mchanganyiko wa mafuta ili kupunguza uzalishaji.  <response>: The association of a monetary value with reduced emissions encourages in the 1990s, 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. 