Scientists now say this worst-case climate scenario is ‘implausible.’ Here’s what it means

illuminem summarises for you the essential news of the day, reviewed by our editorial team. Read the full piece on The Washington Post or enjoy below:

🗞️ Driving the news: The IPCC is set to retire the RCP 8.5 emissions scenario, long used to model extreme climate outcomes if fossil fuel use continued unchecked
• Scientists now regard it as highly improbable due to falling coal demand, rapid renewable deployment, and stronger climate policies

🔭 The context: RCP 8.5 assumed continued high coal use and minimal mitigation, often cited as a “business-as-usual” baseline despite being a low-probability, high-emission scenario
• Updated analyses show observed emissions and energy trends no longer align with its assumptions, prompting a shift toward more realistic pathways

🌍 Why it matters for the planet: Even without RCP 8.5, intermediate warming scenarios still threaten extreme heat events, droughts, floods, and biodiversity loss
• Accurate scenario use informs better adaptation and mitigation planning globally

⏭️ What’s next: The IPCC will prioritize a range of plausible emissions trajectories, reflecting current policies, renewable growth, and energy transition trends
• Governments and companies will update climate risk and resilience strategies accordingly

💬 One quote: “The scenarios we create today are different than the scenarios we created 15 years ago, because the world is different today than 15 years ago.” – Zeke Hausfather, Berkeley Earth

📈 One stat: RCP 8.5 projected global warming above 4°C by 2100; current energy and emissions trends make this outcome increasingly unlikely

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