The ruling should usher in significantly broader and stricter statewide controls on all manner of global warming pollution, including most major sources of carbon dioxide.
It is the most impressive victory to date in a campaign orchestrated in part by the advocacy group Our Children's Trust, which has mounted court challenges on climate change on behalf of youth clients in the federal district court in Oregon, and in the state courts of Pennsylvania, Colorado, Washington and Oregon, as well as in several other countries.
Unless the Massachusetts State Legislature reverses course, which seems unlikely, the decision by the state's highest court settles the matter.
Just how quickly the year-by-year reductions will be achieved in Massachusetts, and how many new sources of emissions will have to be brought under the tight new limits, remains to be seen. The court did not spell out how regulators must act—only that they must not sidestep the law.
The Global Warming Solutions Act requires that statewide emissions be cut by 80 percent from 1990 levels by 2050.
That target, the high court noted, was based on the state legislature's recognition of the scientific consensus on climate change and its impatience with national and international actions to address the crisis in a meaningful way.
The ruling overturns a lower court decision that the state's environmental agency had substantially complied with the law's aims by enforcing three significant, but not comprehensive, sets of emissions rules.
The most notable rules involve participation in the Regional Greenhouse Gas Initiative, or RGGI, a pact aimed at cutting electric power plant emissions in several northeastern states. The other rules limited the gas sulfur hexafluoride and set standards for low-emission vehicles.
But these did not go far enough, the high court ruled.
It said the law "requires the department to promulgate regulations that address multiple sources or categories of sources of emissions, impose a limit on emissions that may be released, limit the aggregate emissions released from each group of regulated sources or categories of sources, set emissions limits for each year, and set limits that decline on an annual basis."
The case, Kain et al. v. Massachusetts Department of Environmental Protection, was brought by four youth plaintiffs and two New England environmental nonprofit groups, the Conservation Law Foundation, and the Mass Energy Consumers Alliance.
Read more at Youth Win Climate Case Against Massachusetts in State's High Court
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