The 1.5°C Target Is Still Alive, But Only If We Treat It as a Deadline

The Hardest Question in Climate Policy

What would it actually take to keep the 1.5°C target alive? I’ve asked myself this a thousand times, and I’m not satisfied with the usual shrugs that it’s too late or the hollow cheerleading that we’re on track. The truth is uncomfortable: the latest OECD Climate Action Monitor and UNEP data show that under current policies, the world is heading for about 2.8°C of warming this century. That’s not a rounding error—it’s a catastrophe. Yet the same data insists that limiting warming to 1.5°C is still physically possible. So why does the gap between what we’re doing and what we need to do feel like a chasm? And more importantly, what would I actually do about it if I had the levers of power?

The Scale of the Gap We Refuse to Name

Let’s put the numbers on the table. In 2024, global greenhouse gas emissions hit a record 57.7 gigatonnes of CO2 equivalent, up 2.3% from the year before (OECD Climate Action Monitor 2025 / UNEP). That’s not a slight uptick—it’s a surge. And it’s not just CO2: methane and nitrous oxide are also at record highs, with methane at 1,942 parts per billion in 2024, a 166% jump from pre-industrial levels (WMO GHG Bulletin press release). Meanwhile, the pledges countries have made under the Paris Agreement—their Nationally Determined Contributions—commit us to only a 14% collective reduction by 2030 compared to 2022. The IPCC says we need 43% by 2030 to stay on the 1.5°C path. That’s a gap of 29 percentage points. I don’t need a PhD to see that we’re not even close to pulling our weight.

And here’s the kicker: G20 countries, the world’s biggest emitters, account for 77% of global emissions, and their emissions were still rising in 2024 (OECD Climate Action Monitor 2025 / UNEP). So the nations with the most responsibility are also the ones lagging the most. It’s no wonder the UNEP Emissions Gap Report 2024 projects a median warming of 3.1°C under current policies—even worse than the 2.8°C figure I cited earlier, depending on how you count. The point is, we’re on a path to blow past 1.5°C and even 2°C, and yet we keep talking about “net zero by 2050” as if it’s a distant, abstract promise.

Why the Paris Agreement’s Architecture Is Both a Blessing and a Curse

I’m not going to trash the Paris Agreement—it’s the only global framework we have, and it’s legally binding (UN Climate Action: Paris Agreement). But its central mechanism, the five-year cycle of voluntary national pledges, has a fatal flaw: it relies on countries to be ambitious on their own. The agreement even includes the principle of “common but differentiated responsibilities,” which sounds fair but in practice lets major emitters hide behind “we’re developing” or “we need to grow first.” The result is that NDCs are collectively insufficient, as the OECD bluntly states. And when the first global stocktake concluded at COP28, it called for a “transition away” from fossil fuels—a historic first, but hardly the phaseout that science demands (UN DESA: COP28 outcomes).

Now, contrast that with the Montreal Protocol, the treaty that saved the ozone layer. It set binding targets with teeth—countries had to phase out ozone-depleting substances, and they did. The ozone layer is on its way to recovery (UNEP OzonAction: Montreal Protocol). Why did that work? Because it had clear, mandatory deadlines and a mechanism for adjusting them. The Paris Agreement, by contrast, is a voluntary club with no real enforcement. I’m not saying we should scrap it—I’m saying we should stop pretending that voluntary pledges alone will get us to 1.5°C. We need to make the Paris process harder, not softer.

The One Number That Should Scare Us All: 57.1 Gigatonnes

Let me zoom in on one specific figure that keeps me up at night: 57.1 gigatonnes of CO2 equivalent—that was global emissions in 2023, according to the UNEP Emissions Gap Report 2024. That’s the latest year with full data, and it was a 1.3% increase from 2022. So even as we talk about peaking emissions, we’re not peaking; we’re climbing. And the OECD says 2024 hit 57.7—another record. If we were serious about 1.5°C, we’d be seeing a sharp decline right now, not a rise. The IEA’s Net Zero Roadmap 2023 says we need to triple global renewable power capacity by 2030 and double the rate of energy efficiency improvements—that’s the single biggest lever to 2030. But tripling renewables is a massive undertaking, and we’re not even close to the required annual growth rates.

Imagine for a second that we actually did it. I’m talking about building solar farms at ten times the current pace, rewiring grids, and electrifying everything from cars to steel mills. The IEA estimates that clean energy spending needs to jump from $1.8 trillion in 2023 to $4.5 trillion annually by the early 2030s. That’s real money—about 5% of global GDP. But it’s not impossible; we spend trillions on fossil fuel subsidies and military budgets. The question is political will, not economic feasibility.

What “Transition Away” Really Means—And What It Doesn’t

At COP28, the world agreed to “transition away from fossil fuels”—a phrase that was celebrated as historic, but it’s deliberately vague (UN DESA: COP28 outcomes). It doesn’t say by when, and it doesn’t call for a phaseout. For me, that’s the crux of the problem: we’re negotiating over words while the planet burns. The science is clear: we need to cut emissions 42% by 2030 and 57% by 2035, relative to 2019 levels, to stay at 1.5°C (UNEP Emissions Gap Report 2024). That means we can’t keep building new coal plants, and we need to start shutting down existing ones well before 2030. But the Global Methane Pledge, which over 100 countries signed at COP26, aims to cut methane emissions by 30% by 2030—methane is a potent greenhouse gas, and cutting it is the fastest way to slow warming (US State Department: COP26 Global Methane Pledge). That’s a good start, but it’s not enough on its own.

I’m not calling for a sudden, disruptive shutdown of all fossil fuels tomorrow—that would be unrealistic and socially harmful. But I am saying that every new fossil fuel project should be viewed as a liability, not an asset. The recent record carbon pricing revenues—$104 billion in 2023—show that some countries are starting to put a price on carbon (World Bank). But carbon pricing covers only 24% of global emissions, and the price is often too low to change behavior. We need carbon prices that are high enough to actually shift investment decisions—and we need them globally.

Why I’m Not Giving Up on 1.5°C—Even Though It’s a Long Shot

Here’s the thing: even if 1.5°C is unlikely, giving up on it is a self-fulfilling prophecy. If we aim for 2°C, we’ll get 3°C. The IPCC warns that almost half the world’s population lives in highly vulnerable regions, and that deaths from floods, droughts, and storms are 15 times higher there (IPCC AR6 Synthesis Report). That’s not a future I want to bequeath to my kids. So I’m not going to wave the white flag. Instead, I’m going to push for policies that treat 2030 as a hard deadline, not a suggestion.

And I’m encouraged by some signs: net-zero targets now cover about 88% of global emissions, although only a fraction are legally binding (OECD Climate Action Monitor 2025 / UNEP). The Kigali Amendment to the Montreal Protocol is phasing down HFCs, a major win (UNEP OzonAction: Montreal Protocol). And renewable energy costs have plummeted. But we need to accelerate, not just applaud.

What I’d Actually Do

If I could wave a magic wand, I’d do three things. First, I’d amend the Paris Agreement to include a compliance mechanism that punishes countries that miss their NDCs—not with military force, but with trade sanctions or loss of access to climate finance. That would make the voluntary pledges meaningful. Second, I’d set a global carbon price floor of $100 per tonne of CO2, with higher prices for wealthy nations, and use the revenue to fund adaptation in vulnerable countries. The World Bank says carbon pricing revenues already hit $104 billion in 2023, but that’s chump change compared to what’s needed. Third, I’d invest $4.5 trillion annually in clean energy, as the IEA recommends, by redirecting fossil fuel subsidies and raising taxes on the wealthy.

Would this be politically easy? No. But neither is living with 2.8°C of warming. The choice is stark: we can either act now, with bold policy that might cost us some economic growth in the short term, or we can face the consequences of inaction, which will be far worse. I know which side I’m on. Let’s stop pretending that voluntary pledges are enough, and start treating climate change as the emergency it is.

Sources

• OECD Climate Action Monitor 2025 / UNEP - https://www.oecd.org/en/publications/2025/11/the-climate-action-monitor-2025_aed0c4bb.html
• UNEP Emissions Gap Report 2024 - https://www.unep.org/resources/emissions-gap-report-2024
• IPCC AR6 Synthesis Report - https://www.ipcc.ch/2023/03/20/press-release-ar6-synthesis-report/
• IEA Net Zero Roadmap 2023 - https://www.iea.org/reports/net-zero-roadmap-a-global-pathway-to-keep-the-15-0c-goal-in-reach
• WMO Greenhouse Gas Bulletin - https://wmo.int/news/media-centre/carbon-dioxide-levels-increase-record-amount-new-highs-2024
• 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/