IPCC's Report Climate Change 2021: The Physical Science Basis
The Working Group I contribution to the Sixth Assessment Report addresses the most up-to-date physical understanding of the climate system and climate change, bringing together the latest advances in climate science.
The Intergovernmental Panel on Climate Change (IPCC) Working Group 1 report was written by hundreds of scientists and synthesised more than 14,000 pieces of research. The final summary for policymakers was approved, after changes, by 195 countries through the United Nations.
The IPCC is the United Nations body for assessing the science related to climate change.
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.