When Washington stalls, statehouses move: the US climate-policy split

In the United States, the question of whether climate policy pushes emissions down has no single answer at the national level, because the country runs two contradictory policy engines at once. Factrail's environment model treats decarbonization policy as a structural force that, over time, tends to bend emissions downward. The American record shows how unevenly that force can be applied: federal direction reverses with each change of administration, while a set of states and courts hold a steadier line. The result is not a clean trend but a tug-of-war on the same underlying driver, and the model reads it accordingly.

A federal record that swings

The clearest illustration of the swing sits inside the executive branch itself. In April 2024, the Environmental Protection Agency under Administrator Michael Regan finalized the first carbon limits on existing coal-fired power plants, recorded in Factrail as the EPA power-plant carbon rule. That action registers in the model as a positive push on the decarbonization-policy driver: it set enforceable expectations for the highest-emitting segment of the electricity sector.

Less than a year later, the direction inverted. In January 2025, a new administration ordered a second withdrawal from the Paris Agreement and moved to roll back climate measures. In Factrail's terms, these are opposite-direction actions on the same driver, separated by only a handful of months. This is the analytical core of the American case: the same federal instruments that can be used to tighten emissions standards can be used to loosen them, and the choice turns on who holds the executive branch rather than on any change in the underlying physics of the atmosphere. Read on its own, the federal channel produces oscillation, not progress.

Statehouses as the source of continuity

Where Washington oscillates, several state governments have supplied continuity. California's 2020 order to end new gasoline-car sales by 2035, issued by Governor Gavin Newsom, and Washington State's 2021 Climate Commitment Act, signed by Governor Jay Inslee, created binding, economy-spanning programs designed to operate across the political cycle rather than within it. These are not aspirational targets; they are statutory and regulatory frameworks with compliance obligations attached.

The durability of the state-level approach was tested directly at the ballot box. In 2024, Washington voters rejected an initiative that would have repealed the state's cap-and-invest law, leaving the program intact. That outcome matters for the model because it demonstrates that sub-national decarbonization policy can survive not only a change in the national mood but a deliberate attempt at repeal. The analytical reading is that state action partly offsets federal reversal: when the federal line drops, the state programs keep a portion of the decarbonization driver pointed in the same direction.

The American pattern is best understood not as a national trend but as two engines pulling against each other on one driver — federal direction reversing with each administration while a cluster of states holds a steadier course.

The courts as a third channel

A third channel runs through the judiciary, and it operates on different logic than either elected branch. In 2024, the Montana Supreme Court affirmed a lower ruling in Held v. Montana, recognizing a constitutional right to a stable climate under that state's constitution. As analysis, the significance is narrower than a national mandate but more durable than an executive order: a judicial precedent does not expire when an administration changes, and it can strengthen the legal footing for climate-conscious permitting in jurisdictions where legislatures are divided or hostile. The ruling is a state-constitutional matter, so its direct reach is bounded; its value in the model is as a stabilizing precedent rather than as a guarantee of lower emissions anywhere.

Why the net effect stays uncertain

Factrail does not treat any of these actions — federal, state, or judicial — as guaranteeing a fall in emissions. The global CO2-per-capita line has been slow to move, and none of the documented facts here is a substitute for that outcome. The honest reading is that the decarbonization-policy driver in the United States is pulled in both directions at once: federal reversals subtract from it, while state programs and court rulings add back a contested share. Because the federal direction can flip again with the next administration, and because several of the 2025 actions remain a matter of active dispute, the net effect is flagged as uncertain rather than asserted.

That uncertainty is the point worth carrying forward. A reader looking only at the federal headline will see climate policy lurching back and forth; a reader looking only at California, Washington, and Montana will see steady advance. Both pictures are real, and the model's job is to hold them together without pretending the contradiction has been resolved. The same dynamic — a single jurisdiction trying to lock in a durable framework against a shifting political tide — appears in different form across the Atlantic, where the EU Green Deal architecture was built precisely to outlast the electoral cycle. The American case is the counter-example: a system where the cycle still has the upper hand at the top, and where continuity, for now, has to come from below.