| Year | All greenhouse gases and other forcing agents (incl. aerosols) | 50% probability of below 1.5 °C | 50% probability of below 2 °C |
|---|---|---|---|
| 1970 | 322 | 430 | 530 |
| 1975 | 332 | 430 | 530 |
| 1978 | 340 | 430 | 530 |
| 1979 | 343 | 430 | 530 |
| 1980 | 347 | 430 | 530 |
| 1981 | 349 | 430 | 530 |
| 1982 | 352 | 430 | 530 |
| 1983 | 354 | 430 | 530 |
| 1984 | 357 | 430 | 530 |
| 1985 | 359 | 430 | 530 |
| 1986 | 362 | 430 | 530 |
| 1987 | 365 | 430 | 530 |
| 1988 | 369 | 430 | 530 |
| 1989 | 371 | 430 | 530 |
| 1990 | 373 | 430 | 530 |
| 1991 | 376 | 430 | 530 |
| 1992 | 378 | 430 | 530 |
| 1993 | 380 | 430 | 530 |
| 1994 | 382 | 430 | 530 |
| 1995 | 385 | 430 | 530 |
| 1996 | 388 | 430 | 530 |
| 1997 | 390 | 430 | 530 |
| 1998 | 393 | 430 | 530 |
| 1999 | 396 | 430 | 530 |
| 2000 | 398 | 430 | 530 |
| 2001 | 400 | 430 | 530 |
| 2002 | 402 | 430 | 530 |
| 2003 | 405 | 430 | 530 |
| 2004 | 407 | 430 | 530 |
| 2005 | 410 | 430 | 530 |
| 2006 | 413 | 430 | 530 |
| 2007 | 416 | 430 | 530 |
| 2008 | 420 | 430 | 530 |
| 2009 | 422 | 430 | 530 |
| 2010 | 426 | 430 | 530 |
| 2011 | 430 | 430 | 530 |
| 2012 | 433 | 430 | 530 |
| 2013 | 437 | 430 | 530 |
| 2014 | 441 | 430 | 530 |
| 2015 | 445 | 430 | 530 |