The Working Group I contribution to the Sixth Assessment Report, Climate Change 2021:
The Physical Science Basis is now out. The report addresses the most up-to-date physical understanding of the climate system and climate change, bringing together the latest advances in climate science, and combining multiple lines of evidence from paleoclimate, observations, process understanding, and global and regional climate simulations.
Read the report: https://www.ipcc.ch/assessment-report/ar6/