For over a decade, Massachusetts has been pricing carbon within the electricity sector through a cap-and-trade program called the Regional Greenhouse Gas Initiative, or RGGI. But the power sector in Massachusetts accounts for only 20 percent of the state's emissions.  The remaining 80 percent comes from sources not covered under RGGI––such as heating fuels, transportation, construction, and manufacturing. MAPC supports requiring the Commonwealth to set an economy-wide price on carbon emissions at a sufficient level to have a significant impact on advancing our climate mitigation goals.

To that end, MAPC is supportive of the Transportation Climate Initiative. In December 2018, Massachusetts joined with eight Northeast and Mid-Atlantic states plus the District of Columbia to take a collaborative regional approach to reduce carbon emissions from the transportation sector. This initiative is patterned on the decade-old Regional Greenhouse Gas Initiative (RGGI), which reduces carbon emissions from the electricity sector.