The decision is an important elucidation of the state Constitution's environmental rights amendment, contained in Article 1, section 27. See pages 114-119 of the decision.
The court also found unconstitutional another section of Act 13 that allowed the Department of Environmental Protection to grant waivers for setback requirements from water sources, and sent the issue of the Act 13's "physician gag rule" back to a lower court. The Court said many important things in this decision, among them:
By any reasonable account, exploitation of the Marcellus Shale Formation will produce a detrimental effect on the environment, on the people, their children, and future generations, and potentially on the public purse, perhaps rivaling the environmental effects of coal extraction.