Scientists retire worst-case climate scenario: honest fix or caving in?
Did retiring RCP8.5 fix a genuine scientific mistake, or did pressure and politics water down climate projections when we can least afford it?
A radio-style debate on a real news story, written for A2 learners of English (elementary): simple sentences about familiar topics: prices, travel, work, food, plans.
Hear the whole debate in the app Free every day: today's episode at your level, with a synced transcript and the key vocabulary.
Get it on Google Play iPhone: join the waitlistKey vocabulary
| English | Meaning and example from the episode |
|---|---|
| scenario | a possible situation or set of conditions“Scientists stopped using the worst climate scenario.” |
| climate | long-term weather patterns of a region“Scientists stopped using the worst climate scenario.” |
| projection | a forecast or estimate of future conditions“It is a projection from announced policies.” |
| scientific | based on or relating to science and research“So the retirement is scientific.” |
| extreme | very great in degree; furthest from the center“That is why we test extreme cases.” |
| pathway | a course or route leading somewhere“That is the pathway from today's policies.” |
| usual | commonly or ordinarily happening; normal“RCP8.5 was never "business as usual".” |
| retirement | the act of stopping work or withdrawing from use“So this retirement changes nothing for those people.” |
Who's talking
- Host
- Margaret Chen
Climate modeller and former IPCC contributor - James Whitmore
Energy policy analyst and former oil-sector - Dr. Amara Okonkwo
Climate justice researcher and communication
The panelists are fictional characters, and their voices are generated with AI.
What they debate
- Did RCP8.5 ever mean 'business as usual,' or did media and policymakers misread it for a decade?
- Current policy puts us at 3°C—is the new 3.5°C ceiling still extreme enough to warn about tail risks?
- Who decided this was 'implausible'—and whose voices shaped the scenario retirement decision?
- Does scrapping RCP8.5 give policymakers cover to relax climate effort, or reflect genuine decarbonization progress?
Transcript (beginning)
Hello and welcome. Scientists stopped using the worst climate scenario. Was it right, or did politics change the science? Today: Margaret, climate modeller. James, energy economist. Amara, climate justice researcher. Let's go.
Margaret, you built these scenarios. What was RCP8.5 really meant to be?
RCP8.5 was never "business as usual". It was a stress test. We built it to ask one question: what if everything goes wrong?
No, wait — a stress test everyone sold as the future.
"Everyone"? Not us. The IPCC said it in 2021: these pathways are not business as usual. We wrote it. The news and the governments made it simple. That's not our mistake.
Amara, you work with the Global South. Does this debate matter to them?
Not much, no. The real number is three degrees. That is the pathway from today's policies. Three degrees kills towns by the sea. So this retirement changes nothing for those people.
Sorry, but three degrees is a promise, not a policy.
No. Three degrees is not a promise. It is a projection from announced policies. Policies that exist. The new high scenario still reaches 3.5 degrees by 2100. That is physics, not politics.
Physics, yes. But the number comes from announced policies. And announced policies are politics. Governments announce a lot and then they build gas plants. Look at what actually happened, not the press release.
Amara—if policy numbers are just wishes, what do you tell adaptation planners right now?
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