Platitudes are not science. Don't get your wisdom from blue font; that's absurd.
No, Science is about empirical data, what you can see, and measure.
Within AGW, there is very little empirical data.
Yes the average temperature has warmed over the last century,
and yes greenhouse gas levels in the atmosphere have also increased.
These things we can measure.
The portion of the observed warming that is attributable to the increase in greenhouse gasses is much more subjective.
According to AGW, since
"there is no alterative explanation supported by convincing evidence"
,
Scientific Consensus | Facts – Climate Change: Vital Signs of the Planet
then all the observed warming must be caused from Human activity.
Almost anyone with a Science background would agree that adding greenhouse gasses will force some warming.
The generally accepted level is that doubling the CO2 level, would force about 1.1C of warming, from an energy imbalance of 3.71W/m2.
This is expressed by formulas from the ACS,
Climate Sensitivity - American Chemical Society
ΔFCO2 = (5.35 W·m–2) ln(2) =3.7083W/m2, and,
ΔT ≈ [0.3 K·(W·m–2)–1] (3.71 W·m–2) ≈1.113C.
The ACS page says ,
Our calculated temperature change, that includes only the radiative forcing from increases in greenhouse gas concentrations,
accounts for 20-25% of this observed temperature increase.
but this is not at all accurate.
The total decade averaged observed warming since the pre 1900 average(Hadcrut4) is .93C
CO2 alone using their formula is (5.35 X ln(410/280) X.3)=.61C
If we figure in the other greenhouse gasses, AGGI,
NOAA/ESRL Global Monitoring Laboratory - THE NOAA ANNUAL GREENHOUSE GAS INDEX (AGGI)
then we see that the forcing from added greenhouse gasses in CO2-eq is ,
(5.35 X ln(500/280) X .3)= .93C.
Since the forcing and the observation are almost equal, there is no net feedback in climate sensitivity.
(This really makes me wonder what reference date the ACS used, I cannot think of a time period where the
forcing was only 20-25% of the observed warming.)