Annual CO2 level from https://gml.noaa.gov/ccgg/trends/data.html will be taken as fact -- in 2021 this was 416.45 ppm.
Temperature anomaly (annual average) (base period 1951-80) from NASA Goddard GISTEMP (https://data.giss.nasa.gov/gistemp/tabledata_v4/GLB.Ts+dSST.txt; stable link: https://www.co2.earth/global-warming-update) will be taken as fact -- in 2021 this was 0.84.
If atmospheric CO2 is not in this range in 2030, this market will resolve N/A.
Nov 7, 6:31pm: IF in 2030, atmospheric CO2 is >440 ppm, what will be the global temperature anomaly in 2030? → IF in 2030, atmospheric CO2 is 440-445 ppm, what will be the global temperature anomaly in 2030?
@StevenK Note that the baseline is higher than the usual (preindustrial) baseline, so the anomaly relative to it will be lower.