For optimal experience a modern desktop browser is recommended ... [X]

Carbon Budget

Assuming a Carbon Budget of 400/1000 GtCO₂ from 2011 (IPCC AR5 Synthesis Report)
Data source:
PRIMAP-hist plus bunkers from CDIAC

See the full list of spiral variants - Background, Videos, and GIFs
Original Climate Spiral by Ed Hawkins (Climate Lab Book),
extended with Carbon Budget and Concentration Spiral by
Robert Gieseke and Malte Meinshausen
(PRIMAP Group, Potsdam Institute for Climate Impact Research, Germany &
Australian-German Climate & Energy College, The University of Melbourne, Australia)
Data Processing · Source Code