The Intergovernmental Panel on Climate Change (IPCC) has produced the first part of its 6th climate change report. It is 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.
The summary for policy makers states that
It is unequivocal that human influence has warmed the atmosphere, ocean and land. Widespread and rapid changes in the atmosphere, ocean, cryosphere and biosphere have occurred.
The scale of recent changes across the climate system as a whole and the present state of many aspects of the climate system are unprecedented over many centuries to many thousands of years.
Human-induced climate change is already affecting many weather and climate extremes in every region across the globe. Evidence of observed changes in extremes such as heatwaves, heavy precipitation, droughts, and tropical cyclones, and, in particular, their attribution to human influence, has strengthened since [assessment report 5].
Global surface temperature will continue to increase until at least the mid-century under all emissions scenarios considered.
Global warming of 1.5°C and 2°C will be exceeded during the 21st century unless deep reductions in CO2 and other greenhouse gas emissions occur in the coming decades.
Many changes due to past and future greenhouse gas emissions are irreversible for centuries to millennia, especially changes in the ocean, ice sheets and global sea level.
Further parts of the full report will be published in 2022:
AR6 Climate Change 2022: Impacts, Adaptation and Vulnerability
AR6 Climate Change 2022: Mitigation of Climate Change
AR6 Synthesis Report: Climate Change 2022