• Directs the Department of Ecology (Ecology) to adopt rules establishing a Clean Fuels Program (CFP) to limit the aggregate, overall greenhouse gas (GHG) emissions per unit of transportation fuel energy to 10 percent below 2017 levels by 2028 and 20 percent below 2017 levels by 2035. • Directs Ecology to update, prior to 2032, CFP rules to further reduce GHG emissions from each unit of transportation fuel for each year through 2050, consistent with statutory state emission reduction limits.