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Massachusetts Tops California in Emission Reductions

California and Massachusetts use the same name for climate change legislation, Global Warming Solutions Act, and set the same target date for reductions, 2020. Both achieved their targets 2016, but the Bay State had a tougher goal to meet.
January 8, 2019, 2pm PST | Irvin Dawid
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The Global Warming Solutions Act of 2008 (aka Chapter 298) was signed into law by Mass. Gov. Deval Patrick (D). See (and listen to) Adam Reilly's July 2017 WGBH interview on WGBH of Sen. Marc R. Pacheco (D-Taunton), the law's author, and David Ismay, a senior attorney at the Conservation Law Foundation, which successfully took the state to court, for background on the landmark law.

The Massachusetts law is stronger than California's Global Warming Solutions Act of 2006 (aka Assembly Bill 32) in two important ways:

  • It calls for greenhouse gas (GHG) reductions "between 10 percent and 25 percent below statewide 1990 GHG emission levels by 2020," while AB 32 just called for reduction to "1990 levels."
  • It set a future target date of "80 percent below statewide 1990 GHG emission levels by 2050."

It it true that both California Govs. Schwarzenegger (R) and Brown (D) did call for the same 2050 goal, but those were in the form of executive orders [S-3-05 (pdf) and B-30-15, respectively] as opposed to legislation. Senate Bill 32, approved by the legislature in 2016, extended California's climate law to 2030, calling for reductions to 40 percent below 1990 levels.

Benjamin Swasey of WBUR reports on Jan. 4 that greenhouse gas emissions in Massachusetts declined 2.5 percent in 2016, the year of the most recent greenhouse gas inventory, from 2015. According to the Department of Environmental Protection (MassDEP), emissions decreased by 21% between 1990 and 2016.

By contrast, it was widely reported last July that California had reduced its 2016 emissions, also its most recent GHG inventory, to 1990 levels, meeting its AB 32 goal four years early.

Transportation is tops

Another similarity between the two states – the transportation sector is the largest source of emissions, at 39 percent in Massachusetts and 41 percent in California.

Last month, the Bay State joined with eight other East Coast states and the District of Columbia to develop a policy to price emissions from transportation, set a 'cap' on them, and invest the revenues in low carbon transportation solutions, similar to what California has been doing since 2015 when transportation fuel was added to the cap-and-trade program.

Additional reading: "Climate Change Law in California and Massachusetts: Lessons for State Policy Makers" [pdf], Hastings Environmental Law Journal, Jan 1, 2015.

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