One of the main IPCC activities is the preparation of comprehensive Assessment Reports about the state of scientific, technical and socio-economic knowledge on climate change, its causes, potential impacts and response strategies. The IPCC also produces Special Reports, which are an assessment on a specific issue and Methodology Reports, which provide practical guidelines for the preparation of greenhouse gas inventories.
Since its inception in 1988 the IPCC has prepared five multivolume assessment reports. The Fifth Assessment Report was released between September 2013 and November 2014.
Follow the link to read the reports: https://www.ipcc.ch/report/ar5/