I'm doing my best by using multi-post block to make sense to those who don't want to be political toward climate change issue, specifically Iggle's post.
Note: All data I'm using are official data (NOAA’s Climate.gov, NASA & Mauna Loa CO2 Observatory's CO2 records).
There are 2 warming periods in 20th century global warming: Early Twentieth Century Warming (ETCW). from 1910 to 1945 and the recent warming since 1950s that extends to today, 21th century. Let's take a look at these 2 periods.
ETCW, 1910-1945
From the linked NOAA’s Global surface temperature change chart (I'm using smoothed data, dark red line):
Temperature rise during ETCW, i.e. from 1910 to 1945 is 0.7 C
1910: -0.8 c, 1945: -0.1 C. The difference (increased) between 1910 and 1945 is 0.7 C.
Let’s see CO2 records during this warming period.
From NASA's CO2 records, see linked NASA data in next post. CO2 level at 1910 is 300.1 ppm. CO2 at 1945 is 310.3 ppm. The difference (increased) between 1910 and 1945 is only about 10 ppm
So, atmospheric CO2 rise from 1910 to 1945: 10 ppm.
Recent warming, 1945 -2018
Temperature rise from the recent warming i.e. from 1945 to 2018 is 0.7 C
1945: -0.1 C, 2018: +0.6 C. the difference between 1945 to 2018 is 0.7 C
The CO2 records during this warming period, again, from NASA & Mauna Loa,
1945 is 310.3 ppm, 2018 is 410.16 ppm. The difference (increased) between 1945 and 2018 is about 100 ppm.
So, atmospheric CO2 rise from 1945 to 2018 is 100 ppm
So, the warming during the ETCW period (1910-1945) was associated with a CO2 increase of 10 ppm only, whereas about same amount of warming during the recent warming period was associated with about 100 ppm increase in atmospheric CO2 concentration. That is almost an order of magnitude greater CO2 increase for a comparable amount of global warming.
Unless scientists can explain the early 20th century warming, any reasonable people should have little confidence in their attribution statements regarding the cause of the recent warming (1945-2018).
Link: https://forum.uhnd.com/forum/index.php?action=display&forumid=2&msgid=514312