You Can’t Regulate Your Way Out of Climate Change—But Here’s What Works

Imagine you’re a policy advisor in 2025, tasked with recommending the next big environmental law for your country. You’ve got the Clean Air Act’s success story in one hand, the latest emissions data in the other. You’re tempted to propose a sweeping new regulation, maybe a carbon tax or a ban on something. But before you do, consider this: the world’s most famous environmental law—the Clean Air Act—has been a stunning success, yet global emissions are still climbing. What’s going on?

The blunt truth: environmental policy is not a single lever. It’s a mix of domestic regulation, international agreements, and—crucially—implementation. And if you’re advising a government or an advocacy group, you need to know which tools actually work and which are just expensive placebos.

The Clean Air Act: Proof That Regulation Works

Start with the poster child. The Clean Air Act, signed in 1970, set out to clean up America’s air. It was a bold, command-and-control approach: set national standards, require polluters to meet them, and fine those who don’t. And it worked. Between 1970 and 2020, combined emissions of six common pollutants—including sulfur dioxide, nitrogen oxides, and lead—dropped by 78 percent (EPA). New cars are about 99 percent cleaner for common pollutants than 1970 models (EPA). That’s not a rounding error; that’s a revolution.

But here’s the catch: the Clean Air Act was enacted when the U.S. was the world’s largest emitter, and it regulated pollutants that were local and visible—smog, soot, lead. Climate change is a global, invisible, and long-term problem. You can’t just copy-paste the Clean Air Act onto carbon dioxide and expect the same result. The Montreal Protocol, which phased out ozone-depleting substances, is another success story—it had clear substitutes and industry buy-in. But climate change is different: it’s tied to the very fuels that power economies.

So, what does that mean for you? If you’re designing policy, don’t expect a single law to fix climate change. Instead, focus on policies that can drive down emissions at the source, like performance standards for power plants or vehicles. The Clean Air Act’s success came from setting strict standards and letting industry find the cheapest way to meet them. That’s a lesson that still applies.

The International Treadmill: Why Global Pledges Fall Short

Now zoom out. International agreements like the Paris Agreement are essential—but they’re not enough. The Paris deal asks countries to submit voluntary national plans (NDCs) and ratchet them up every five years. As of now, those pledges commit to only a 14% collective reduction by 2030 versus 2022 levels—far short of the 43% the IPCC says is needed to limit warming to 1.5°C (OECD/UNEP). And it’s not just the pledges; the actions aren’t matching the rhetoric. G20 countries account for 77% of global emissions, and their emissions were still rising in 2024 (OECD/UNEP).

Let’s be brutally honest: the Paris Agreement is a necessary but insufficient framework. It’s a “pledge and review” system, not a “comply or else” treaty. The Kyoto Protocol, which did have binding targets, was abandoned by the U.S. and eventually fizzled. So, what’s the lesson? International agreements can set the direction, but they only work if domestic policies back them up. You can’t rely on a global summit to save the day.

Instead, focus on what drives real change: domestic laws that create economic incentives. Carbon pricing is one such tool. In 2023, carbon taxes and emissions trading systems covered 24% of global emissions and raised a record $104 billion in revenue (World Bank). That’s real money—money that can be invested in clean energy or returned to citizens. But carbon pricing alone won’t do it either. You need a portfolio of policies: regulations, subsidies, and pricing.

So, What Should You Actually Recommend?

Here’s where I take a clear stance: if you’re advising a government that wants to cut emissions fast, prioritize three things:

• Regulate methane. Methane accounts for half of the warming we’ve experienced in the past decade, and cutting it is the fastest way to slow warming (State Department). The Global Methane Pledge—a voluntary commitment to cut methane 30% by 2030—has over 100 countries on board, but it’s non-binding. Make it binding in your jurisdiction.
• Clean up the electricity sector. IEA’s Net Zero Roadmap says tripling global renewable power capacity by 2030 is the single largest driver of emissions reductions (IEA). That means policies that speed up permitting for wind and solar, and that phase out coal.
• Set efficiency standards. Doubling the rate of energy efficiency improvements could cut emissions significantly (IEA). Think building codes, appliance standards, and vehicle fuel-economy rules.

These aren’t sexy, but they work. The Clean Air Act proved that strict standards can drive innovation. The Montreal Protocol proved that international cooperation can solve a global problem if the alternatives are feasible. The lesson for climate? We need both domestic grit and international pressure, but the grit has to come first.

What to Remember When the Next Crisis Hits

You’re going to face a moment when a new environmental crisis makes headlines—maybe it’s a chemical spill, an ozone hole, or a heatwave. Your instinct will be to call for a new law. But before you do, ask yourself: is this a problem that a single country can solve? If it’s local, like a contaminated river, then the Clean Water Act’s permit system—which requires a permit for any point-source discharge—is a proven model (EPA). If it’s global, like climate change, then you need to think about international cooperation, but also about what your country can do unilaterally.

The single most important thing to remember: Environmental policy is not about passing laws; it’s about achieving outcomes. The Clean Air Act didn’t just get passed; it got implemented, enforced, and updated. The Paris Agreement has been ratified by 195 parties, but emissions are still rising. So, when you’re in the room where it happens, push for policies that have teeth, that are measurable, and that can be enforced. And don’t be afraid to start small—local air quality rules, state-level renewable mandates, city-level building codes. That’s where the real progress happens.

Sources

• EPA Summary of the Clean Air Act - https://www.epa.gov/laws-regulations/summary-clean-air-act
• EPA Progress Cleaning the Air - https://www.epa.gov/clean-air-act-overview/progress-cleaning-air-and-improving-peoples-health
• OECD Climate Action Monitor 2025 / UNEP - https://www.oecd.org/en/publications/2025/11/the-climate-action-monitor-2025_aed0c4bb.html
• World Bank State and Trends of Carbon Pricing 2024 - https://www.worldbank.org/en/news/press-release/2024/05/21/global-carbon-pricing-revenues-top-a-record-100-billion
• IEA Net Zero Roadmap 2023 - https://www.iea.org/reports/net-zero-roadmap-a-global-pathway-to-keep-the-15-0c-goal-in-reach
• US State Department: COP26 Global Methane Pledge - https://2021-2025.state.gov/dipnote-u-s-department-of-state-official-blog/five_things_to_know_about_cop26/