California Leads on Climate Disclosure as Trump Rolls Back Federal Environmental Protections

A sharp and widening divide is reshaping environmental policy in the United States — and its consequences are being felt far beyond American borders. While the Trump administration accelerates federal deregulation, dismantling key pollution controls and conservation rules, individual US states are stepping into the breach with ambitious climate legislation. For European citizens, businesses, and policymakers watching from across the Atlantic, this transatlantic tension offers both a warning and a lesson.

California Sets the Bar: Mandatory Climate Disclosure for Big Business

In a landmark move, the California Air Resources Board (CARB) has approved new rules requiring companies with annual revenues exceeding $1 billion to publicly report their greenhouse gas (GHG) emissions and climate-related financial risks. The deadline for compliance is August 2026, and the rules apply to any business operating in California — regardless of where the company is headquartered.

This is no small matter. California’s economy is the fifth largest in the world, meaning thousands of multinational corporations, including many with European operations, will need to align with these standards. The move directly mirrors the spirit of the EU’s own Corporate Sustainability Reporting Directive (CSRD), which similarly compels large companies to disclose environmental and social impact data. In a context where the Trump administration has moved to halt federal GHG tracking through the EPA, California’s rules ensure that transparency on climate change is not lost entirely at the national level.

For European companies already navigating CSRD requirements, California’s framework may add another layer of reporting obligations — but it also reinforces a global trend toward mandatory environmental accountability that is unlikely to reverse.

Federal Rollbacks: Conservation, Superfund Sites, and the Cost of Deregulation

The contrast at the federal level could not be starker. The Trump administration is pursuing a sweeping deregulation agenda with serious implications for biodiversity, conservation, and pollution control:

• The Bureau of Land Management (BLM) conservation rule protecting 245 million acres of public land is set to be revoked, opening vast territories to mining and timber extraction.
• The EPA plans to delist eight Superfund sites — contaminated areas requiring urgent cleanup — redefining cleanup standards partly to accelerate the construction of AI data centres and infrastructure projects.
• Federal GHG reporting requirements for power plants are being rolled back, reducing visibility into one of the country’s largest sources of climate pollution.

From a European perspective, these decisions raise serious concerns. The weakening of Superfund protections, in particular, signals a troubling shift in how pollution remediation is prioritised — subordinating public health and environmental policy to short-term economic and technological interests. The rollback of land conservation rules also threatens ecosystems that play a critical role in carbon sequestration, directly undermining global efforts to limit climate change.

Bright Spots: Virginia Rejoins RGGI, and SBTi Advances Corporate Net-Zero Standards

Not all news from the US is bleak. Virginia has re-entered the Regional Greenhouse Gas Initiative (RGGI), a cap-and-trade programme involving ten East Coast states, through a state budget amendment. The move restores a key market mechanism for cutting carbon emissions and will channel funds toward reducing energy costs for residents — a model of environmental policy that combines climate ambition with social equity.

Meanwhile, on the corporate standards front, the Science Based Targets initiative (SBTi) continues to advance its net-zero frameworks, with over 2,000 companies currently guided by its standards. A public consultation on the automotive sector is open until 22 March, a power sector pilot is underway, and a revised Corporate Net Zero Standard is expected in spring 2026. These developments are particularly relevant for European businesses seeking credible, science-aligned pathways to decarbonisation under frameworks compatible with both EU taxonomy and international climate commitments.

Implications for Europe and the Global Climate Agenda

The US policy landscape in 2025 illustrates a fundamental truth: federal inaction does not eliminate climate action — it redistributes it. States, cities, and corporations are filling the vacuum left by Washington, often in ways that align more closely with European regulatory expectations than with the current federal stance.

For European policymakers, this reinforces the importance of maintaining robust environmental policy frameworks even amid economic pressures. For businesses, it underscores the value of proactive compliance with standards like CSRD and SBTi — because the direction of travel globally, from California to Brussels, is toward greater transparency and accountability, not less.

Key takeaway: As the US federal government retreats from environmental commitments, state-level leadership and international corporate standards are becoming the true frontline of climate and environmental policy. Europe’s regulatory ambition has never been more relevant — or more necessary — as a global reference point.