Global Coral Bleaching Threatens Ecosystems Coral reefs passed climate tipping point at 1.4°C. Report led by Tim Lenton (160 scientists). Coral reefs support 1B people and marine life. 80% of reefs bleached; temps at 1.4°C. Amazon and ocean currents near tipping points. Climate | Biodiversity | Environmental Threats UK | South America | Brazil Tim Lenton 3 weeks ago