Over at Chiefio, https://chiefio.wordpress.com/2019/05/11/ghcn-v3-3-vs-v4-asia-anomaly/#comment-112097 he/she has done a terrific analysis of global temperatures, with focus on “anomalies”. Must see.
Looking at those graphs, I just can’t see any way to justify the claim that it is caused by CO2. CO2 is a slow gradual effect over decades (per the claims) and with stong DECAY of effect with concentration. It doesn’t “do nothing” until 2000 then give a 1 C to 2 C step change. It doesn’t “trim off the cold years” and only narrow the range of variability while not raising the warmer years in one country, while doing something quite different in the country right next door.
I’d like to think I gave him/her some pointers to move into Python, a database, etc. He/she didn’t (yet?) get into using Pandas for data analysis, but someday maybe.