ipcc.ch

Chapter 3 of the report discusses the impacts and risks associated with global warming reaching 1.5°C above pre-industrial temperatures compared to 2°C. The chapter examines observed impacts, projected risks, and changes in the climate system since the AR5 report. Various risks are identified for natural and human systems, including changes in extreme weather events, sea level rise, and impacts on ecosystems. Limiting global warming to 1.5°C is shown to have benefits in reducing risks to human health, ecosystems, food security, and economic sectors. The text also highlights how overshooting the 1.5°C target poses risks, emphasizing the need for immediate global efforts to mitigate greenhouse gas emissions. The summary further explores the differences in risks between 1.5°C and 2°C of global warming in areas such as biodiversity, urban areas, small islands, and coastal regions. It concludes by mentioning the increased risks for various reasons of concern due to rising global temperatures, including threats to unique ecosystems and extreme weather events, among others.