Short answers, pulled from the story.
Global surface temperatures have risen by 1.1 degrees Celsius above pre-industrial levels. Scientists project further increases; with current mitigation policies, the temperature will be about 2.7 degrees Celsius above pre-industrial levels by 2100.
Between 70% and 90% of today's warm-water coral reefs will disappear even if warming is kept to 1.5 degrees Celsius. Coral reefs are threatened by both rising ocean temperatures, which cause bleaching and mass death events, and ocean acidification from absorbed carbon dioxide.
The World Bank estimated in 2018 that climate change will cause internal migration of between 31 and 143 million people by 2050 across Sub-Saharan Africa, South Asia, and Latin America. Extreme weather events already displaced approximately 30 million people in 2020 alone.
A 2024 study found that the temperature rise from 1960 to 2019 alone has cut current GDP per capita by 18%, and that a 1 degree warming reduces global GDP by 12%. In a scenario where temperatures rise by 4 degrees Celsius by 2100, global GDP could be reduced by 30% in the worst case.
The West Antarctic and Greenland ice sheets, the Amazon rainforest, and warm-water coral reefs are cited as tipping points that may already be close to or have crossed critical thresholds. The complete loss of the West Antarctic ice sheet would cause over 5 metres of sea level rise, while complete loss of the Greenland ice sheet would contribute 7 metres.
People in poverty, children, indigenous peoples, women, and residents of small island nations and low-lying coastal regions face disproportionate risks. Children under 14 are 44% more likely to die from environmental factors, and the entire populations of nations such as Kiribati, the Maldives, the Marshall Islands, and Tuvalu are at risk of displacement from sea level rise.