| Year | All greenhouse gases including aerosols | 50 % probability of below 2 °C | 50 % probability of below 1.5 °C |
|---|---|---|---|
| 1970 | 322.41 | 545.0 | 478.0 |
| 1971 | 545.0 | 478.0 | |
| 1972 | 545.0 | 478.0 | |
| 1973 | 545.0 | 478.0 | |
| 1974 | 545.0 | 478.0 | |
| 1975 | 332.37 | 545.0 | 478.0 |
| 1976 | 545.0 | 478.0 | |
| 1977 | 545.0 | 478.0 | |
| 1978 | 340.57 | 545.0 | 478.0 |
| 1979 | 343.78 | 545.0 | 478.0 |
| 1980 | 346.82 | 545.0 | 478.0 |
| 1981 | 348.88 | 545.0 | 478.0 |
| 1982 | 351.5 | 545.0 | 478.0 |
| 1983 | 354.04 | 545.0 | 478.0 |
| 1984 | 356.67 | 545.0 | 478.0 |
| 1985 | 359.14 | 545.0 | 478.0 |
| 1986 | 361.81 | 545.0 | 478.0 |
| 1987 | 364.44 | 545.0 | 478.0 |
| 1988 | 368.37 | 545.0 | 478.0 |
| 1989 | 371.24 | 545.0 | 478.0 |
| 1990 | 373.23 | 545.0 | 478.0 |
| 1991 | 376.21 | 545.0 | 478.0 |
| 1992 | 377.84 | 545.0 | 478.0 |
| 1993 | 379.32 | 545.0 | 478.0 |
| 1994 | 381.84 | 545.0 | 478.0 |
| 1995 | 384.76 | 545.0 | 478.0 |
| 1996 | 387.4 | 545.0 | 478.0 |
| 1997 | 389.29 | 545.0 | 478.0 |
| 1998 | 392.85 | 545.0 | 478.0 |
| 1999 | 396.01 | 545.0 | 478.0 |
| 2000 | 397.9 | 545.0 | 478.0 |
| 2001 | 399.54 | 545.0 | 478.0 |
| 2002 | 401.84 | 545.0 | 478.0 |
| 2003 | 404.83 | 545.0 | 478.0 |
| 2004 | 406.71 | 545.0 | 478.0 |
| 2005 | 409.3 | 545.0 | 478.0 |
| 2006 | 412.73 | 545.0 | 478.0 |
| 2007 | 416.47 | 545.0 | 478.0 |
| 2008 | 420.12 | 545.0 | 478.0 |
| 2009 | 422.81 | 545.0 | 478.0 |
| 2010 | 426.49 | 545.0 | 478.0 |
| 2011 | 429.83 | 545.0 | 478.0 |
| 2012 | 433.35 | 545.0 | 478.0 |
| 2013 | 437.66 | 545.0 | 478.0 |
| 2014 | 441.16 | 545.0 | 478.0 |
| 2015 | 444.83 | 545.0 | 478.0 |
| 2016 | 449.65 | 545.0 | 478.0 |
| 2017 | 453.51 | 545.0 | 478.0 |