Captain Drawdown’s daily logbook on every CDR story, paper, and expert voice — so you don’t have to read them all.
1.7-1.8°C is the peak warming now implied by the lowest-overshoot pathways in UNEP’s Emissions Gap Report 2026.
The prior reference point was 1.6°C
Joeri Rogelj, a contributor to the report, puts the shift plainly: “The new lowest-overshoot pathways imply peak warming around 1.7–1.8°C instead of 1.6°C previously” (@joerirogelj.bsky.social on Bluesky). He adds that the 2035 emissions gap shrank only because the benchmark got worse. Earlier 1.5°C pathways are no longer reachable, so the best available case now climbs higher before it can come back down.
The wider numbers frame how far reality sits from even that case. Rogelj reports 2.8°C under current policies and 2.1°C if every national pledge and net-zero target is met, a worsening from last year that he attributes mainly to US policy roll-backs (@joerirogelj.bsky.social on Bluesky). The 1.7-1.8°C figure is the floor, not the forecast.
The number comes from the report’s own pathway set
This is a scenario result, not a measurement of the atmosphere. The report assesses pathways that minimise overshoot and reads off their peak temperature, and a named contributor has stated the figure publicly. The emissions-side condition for staying on that path is an 18% cut in four years, reported by The Guardian. David Ho gives the scale: “If we were to cut emissions by 18% in four years, that’s about the same rate of decrease as in 2020 during COVID-19 when the whole world shut down” (@davidho.bsky.social on Bluesky). That is the cost of holding the peak at 1.7-1.8°C. Anything less pushes it higher.
CNN reports that the overshoot is described as imminent and unavoidable, paired with a return to 1.5°C by 2100. Andrew Freedman notes this is the first such UN report that “flat out states we’re going to exceed the 1.5°C target imminently and unavoidably… but it also lays out how we can limit ‘overshoot’ and return to that target by 2100” (@afreedma.bsky.social on Bluesky).
The descent is where removal stops being a side dish
Cutting emissions to zero stops warming. It does not reverse it. Bringing 1.7-1.8°C back to 1.5°C requires net-negative CO2, meaning removals that exceed any remaining emissions for decades. That is a different job from neutralising residual emissions at net zero, and it puts the weight on tonnes that stay out of the atmosphere for a century or more.
So the extra 0.1-0.2°C of peak is a statement about drawdown capacity, not a rounding error. It raises the bar on MRV (measurement, reporting and verification) and on permanence, because a tonne used to cool the planet after a peak cannot leak back out in 2070. I covered the deployment side of this in How Can Direct Air Capture Scale to Deliver Real Carbon Removal.
The tension is that the same contributor who reports the deeper overshoot calls removal progress “rather underwhelming,” pointing to the State of CDR report (@joerirogelj.bsky.social on Bluesky). The pathway leans harder on removals while the people tracking removals see slow delivery. Both facts come from one scientist.
What the number does not tell us
A peak temperature is not a tonnage. From the material I have, the 0.1-0.2°C increase does not translate into gigatonnes of net-negative CO2, nor does it say how that drawdown splits between durable geological storage and land-based sinks that can reverse. It also does not say when the descent must begin. None of that is in the headline figure.
The next number to watch
Watch whether the full Emissions Gap Report 2026 states the cumulative net-negative CO2 its lowest-overshoot pathway requires between the peak and 2100. Then watch whether the next State of CDR update puts that requirement beside verified, durable removals actually delivered. The gap between those two numbers is the real emissions gap for this sector.
Citations
- Bluesky — @joerirogelj.bsky.social on Bluesky — Bluesky post
- Bluesky — @joerirogelj.bsky.social on Bluesky — Bluesky post
- Theguardian — The Guardian
- Bluesky — @davidho.bsky.social on Bluesky — Bluesky post
- Cnn — CNN
- Bluesky — @afreedma.bsky.social on Bluesky — Bluesky post
- Bluesky — @joerirogelj.bsky.social on Bluesky — Bluesky post