Year
|
All greenhouse gases including aerosols
|
Threshold
|
50 % probability of below 2 °C
|
50 % probability of below 1.5 °C
|
All greenhouse gases*
|
1970
|
322.4
|
450
|
430
|
530
|
291.7
|
1975
|
332.4
|
450
|
430
|
530
|
302.9
|
1978
|
340.3
|
450
|
430
|
530
|
311.5
|
1979
|
343.5
|
450
|
430
|
530
|
314.9
|
1980
|
346.6
|
450
|
430
|
530
|
318.2
|
1981
|
349
|
450
|
430
|
530
|
320.9
|
1982
|
351.7
|
450
|
430
|
530
|
323.8
|
1983
|
354.2
|
450
|
430
|
530
|
326.7
|
1984
|
356.8
|
450
|
430
|
530
|
329.6
|
1985
|
359.3
|
450
|
430
|
530
|
332.4
|
1986
|
362
|
450
|
430
|
530
|
335.4
|
1987
|
364.6
|
450
|
430
|
530
|
338.3
|
1988
|
368.6
|
450
|
430
|
530
|
342.5
|
1989
|
371.4
|
450
|
430
|
530
|
345.6
|
1990
|
373.4
|
450
|
430
|
530
|
348
|
1991
|
376.4
|
450
|
430
|
530
|
350.7
|
1992
|
378.1
|
450
|
430
|
530
|
352.1
|
1993
|
379.6
|
450
|
430
|
530
|
353.4
|
1994
|
382.1
|
450
|
430
|
530
|
355.7
|
1995
|
385
|
450
|
430
|
530
|
358.4
|
1996
|
387.7
|
450
|
430
|
530
|
360.7
|
1997
|
389.6
|
450
|
430
|
530
|
362.4
|
1998
|
393.2
|
450
|
430
|
530
|
365.6
|
1999
|
396.3
|
450
|
430
|
530
|
368.5
|
2000
|
398.3
|
450
|
430
|
530
|
370.2
|
2001
|
400.1
|
450
|
430
|
530
|
372.4
|
2002
|
402.3
|
450
|
430
|
530
|
374.9
|
2003
|
405.3
|
450
|
430
|
530
|
378.2
|
2004
|
407
|
450
|
430
|
530
|
380.4
|
2005
|
409.6
|
450
|
430
|
530
|
383.3
|
2006
|
413.1
|
450
|
430
|
530
|
385.9
|
2007
|
416.1
|
450
|
430
|
530
|
388
|
2008
|
419.8
|
450
|
430
|
530
|
390.8
|
2009
|
422.5
|
450
|
430
|
530
|
392.6
|
2010
|
426.2
|
450
|
430
|
530
|
395.4
|
2011
|
429.5
|
450
|
430
|
530
|
397.8
|
2012
|
433
|
450
|
430
|
530
|
400.5
|
2013
|
437.3
|
450
|
430
|
530
|
403.9
|
2014
|
440.6
|
450
|
430
|
530
|
406.4
|