References for 2020 links

[1] CE comment by Mike Jonas, 12/04/2012

[2] WUWT post "Circular logic not worth a millikelvin", 12/13/2012

[3] Shaun Lovejoy's EOS article "Climate Closure", 20/10/2015

[4] JC's post criticizing [3], 10/23/2015

[5] My post supporting [4], 11/3/2015

[6] Comment in [5] giving a graph based on CO2 since 1950, 11/3/2015