The landmark 2018 IPCC special report that detailed catastrophic differences between 1.5°C and 2°C warming, reshaping climate targets.
Half a Degree Matters
Released October 8, 2018, the IPCC Special Report on Global Warming of 1.5°C showed dramatic differences between 1.5°C and 2°C: tens of millions fewer climate refugees, half as many species extinctions, significantly less sea level rise, fewer deadly heat waves. The message: every fraction of warming matters immensely.
Twelve Years to Transform
The report stated limiting warming to 1.5°C required “rapid, far-reaching and unprecedented changes in all aspects of society.” Global emissions must peak by 2025 and reach net-zero by 2050. The “12 years” framing (to 2030) dominated headlines. Climate activists cited the report demanding urgent action.
Policy Impact
The 1.5°C target became new climate movement benchmark, replacing 2°C. Greta Thunberg and school strikers invoked it. The Green New Deal aimed for it. But by 2023, the world was on track for 2.4-2.8°C, with 1.5°C likely exceeded by 2030s. The report clarified stakes but couldn’t force political will to meet them.
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