So convenient.....everyone is selfishly lying creating a false narrative.......you say "no conspiracy".....but what you describe is a full blown nut job conspiracy theorey.
97% of climate scientists have alterior motives and aren't telling the truth?
Yeah right.
Think for christs sake.
There is no conspiracy nor is anyone lying!
The data is highly subjective, and depending on what is modeled in the simulation affects the results.
Take the IPCC's AR6 report
Summary for Policymakers,
(Which also opens the question of what is summarized, when the main report is not complete.)
A.1.3 The likely range of total human-caused global surface temperature increase from 1850–1900 to 2010–2019 11 is 0.8°C to
1.3°C, with a best estimate of 1.07°C. It is likely that well-mixed GHGs contributed a warming of 1.0°C to 2.0°C, other
human drivers (principally aerosols) contributed a cooling of 0.0°C to 0.8°C, natural drivers changed global surface
temperature by –0.1°C to +0.1°C, and internal variability changed it by –0.2°C to +0.2°C.
The statement starts by saying that the observed global averaged warming since the pre 1900 average,
is between 0.8°C to 1.3°C, a spread of 0.5°C. They go on to speculate (guess), that added greenhouse
gasses
may have caused warming of between 1.0°C to 2.0°C, but that aerosols
may have caused cooling of
between 0.0°C to 0.8°C.
Let's discuss briefly why they might believe the actual GHG warming might have a high end of 2.0°C.
The
NOAA AGGI is most of the greenhouse gasses presented as CO2-eq. The 1900, level is about 310 ppm,
and the 2020 level is 504 ppm. Simple forcing would place the warming at 5.35 X ln(504/310) X .3 = 0.78°C.(
ACS formulas)
To get from 0.78°C to 2.0°C, requires a feedback factor of 2.56, which corresponds to a 2XCO2 ECS of 2.81°C.
No one is lying, because that is in fact the average of the simulations for modeling ECS (An abrupt doubling of the CO2 level).
The problem is that they are simulating a condition that cannot exists, the CO2 level cannot double abruptly!
The question becomes, why simulate something that cannot happen?
The answer is in the
IPCC AR6 technical summary, in box TS.3 on page 72.
Since CMIP6 contains several ESMs that exceed the upper bound of the assessed very likely range in future surface warming,
these models can be used to develop low-likelihood, high warming storylines to explore risks and vulnerabilities,
even in the absence of a quantitative assessment of likelihood.
Some of the model runs have long high end tails, that can be used to tell a high warming story of the future.
A what if scenario. No one is lying, but they are not fully describing the uncertainty ether.