IPCC Special Report on 1.5: Limiting global warming without temperature "overshoot" Analysis The IPCC Special Report on 1.5 opts for a rigorous interpretation of the 1.5 limit on global warming. It has good reasons to do so: "Overshooting" that target risks irreversible impacts and damage for societies and ecosystems, and increases reliance on unproven, high-risk geoengineering technologies. By Linda Schneider