A strong correlation between CO2 levels and global temperatures is a necessary condition of the CO2-based AGW hypothesis.
So, what does a strong correlation look like?
Well,
for example, the top chart (A) for two economic variables reveals an
incredibly strong correlation, a 'cause and effect' that is strikingly
obvious since 2007. (see original here)
The bottom chart (B) reveals the correlation between temperatures (GISS/NASA) and CO2 levels during the exact same time period as chart A.
Look carefully - THERE IS NO CORRELATION! And over the last 15 years, the R2 equals a miserably low 0.05
Unicorn climate science ignores the empirical evidence, replaced with wishful fantasies that don't exist in the real world.
P.S. Yep, the bottom chart does plot a slight cooling trend for the NASA temperature dataset since January 2007. (NASA/CO2 plot sources here; used Excel to produce the plots, linear trend and correlation)