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Story summary
- Scientists warn that the danger of climate tipping points is a surge in extreme-weather variability that precedes system collapse.
- Researchers report that the West Antarctic and Greenland ice sheets have passed their tipping-temperature thresholds, triggering meltwater, ocean-circulation and sea-ice changes that will produce more heatwaves, cold spells, floods and droughts.
- Rising variability threatens agriculture, infrastructure, insurance pricing and risk management because risk assessments have largely omitted it, leaving societies unprepared.
