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New Climate Projections: 4°C Warming Averted, But Danger Remains
4 Jun
Summary
- Worst-case 4°C warming scenario retired due to renewable energy growth.
- Current policies still set planet on track for drastic climate change.
- Paris Agreement goals now require temporary temperature overshoot.
Global climate scientists have unveiled updated emission scenarios, replacing the long-standing RCP8.5 'doomsday' scenario that predicted over 4°C warming by 2100. This extreme pathway has been retired due to significant global advancements in renewable energy and climate policy implementation, particularly in countries like China.
The new highest emission scenario now projects around 3.5°C warming by 2100. While this marks a positive shift, scientists caution that current policies still trajectory the planet towards dangerous climate change. Achieving the Paris Agreement's goal of limiting warming to 1.5°C is no longer feasible without temporary overshoot.
This 'overshoot' means exceeding the 1.5°C threshold before potentially returning to it by 2100. The revised scenarios underscore an increased difficulty in reaching low emission levels, making adaptation efforts more critical, especially for nations like India already experiencing severe climate impacts.
These updated scenarios are vital for ongoing climate research, including the forthcoming seventh UN IPCC assessment report. They aim to simulate a range of climate processes and outcomes, informing global climate policy and adaptation strategies for an increasingly vulnerable world.
