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The purpose of SCOTUS isn’t to rule based on what the desired outcome is, it’s to rule based on what the law explicitly does say and is permitted to say per the Constitution.Your positivist legal philosophy is not shared by the Roberts Court.
> it’s not hard to see that the executive branch took action that the legislative branch never gave them
The dissenting opinion explicitly argues that Congress did explicitly grant the Executive to explicitly regulate GHG emissions, both the manner and the amount.
"The limits the majority now puts on EPA’s authority fly in the face of the statute Congress wrote. The majority says it is simply “not plausible” that Congress enabled EPA to regulate power plants’ emissions through generation shifting. Ante, at 31. But that is just what Congress did when it broadly authorized EPA in Section 111 to select the “best system of emission reduction” for power plants. The “best system” full stop—no ifs, ands, or buts of any kind relevant here. The parties do not dispute that generation shifting is indeed the “best system” the most effective and efficient way to reduce power plants’ carbon dioxide emissions. And no other provision in the Clean Air Act suggests that Congress meant to foreclose EPA from selecting that system; to the contrary, the Plan’s regulatory approach fits hand-in-glove with the rest of the statute. The majority’s decision rests on one claim alone: that generation shifting is just too new and too big a deal for Congress to have authorized it in Section 111’s general terms. But that is wrong. A key reason Congress makes broad delegations like Section 111 is so an agency can respond, appropriately and commensurately, to new and big problems. Congress knows what it doesn’t and can’t know when it drafts a statute; and Congress therefore gives an expert agency the power to address issues—even significant ones—as and when they arise. That is what Congress did in enacting Section 111. The majority today overrides that legislative choice. In so doing, it deprives EPA of the power needed—and the power granted—to curb the emission of greenhouse gases."