This animated spiral portrays the simulated changes in the global averaged monthly air temperature from 1850 through 2100 relative to the 1850 – 1900 average. The temperature data are from Community Climate System (CCSM4) global climate model maintained by the National Center for Atmospheric Research. The simulation is for the IPCC Representative Concentration Pathway 8.5 (RCP8.5) emission scenario. RCP8.5 is the most aggressive scenario in which green house gases continue to rise unchecked through the end of the century, leading to an equivalent of about 1370 ppm CO2, which is roughly four times the concentration at present. The CCSM4 simulation is part of the 5th Climate Model Intercomparison Program (CMIP5) and the data can be downloaded at https://pcmdi.llnl.gov/projects/cmip5/. The 21st century animations are an extension of the graphic (http://www.climate-lab-book.ac.uk/2016/spiralling-global-temperatures/) for the 1850-2010 observed air temperature created by E. Hawkins at Reading University, UK.