There's the UN Intergovernmental Reports. https://research.un.org/en/climate-change/reports https://research.un.org/en/climate-change/reports particularly this

There's the UN Intergovernmental Reports. https://research.un.org/en/climate-change/reports https://research.un.org/en/climate-change/reports particularly this, most recent, one: https://science2017.globalchange.gov/ https://science2017.globalchange.gov/