The Intergovernmental Panel on Climate Chan (IPCC) AR (Assessment Report) is the United Nations’ most comprehensive scientific evaluation of climate change. Here is a quick explanation: What it is: A major report published every 6–7 years by the Intergovernmental Panel on Climate Change (IPCC). It summarizes all the latest scientific research on climate change. What it covers: How and why the climate is changing Impacts on ecosystems, economies, and societies Future climate