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This is uncertain. I believe that CO2 still causes warming, but so small it isn't relevant.CO2 is currently low and has no effct on climate because green plants convert it to O2 and that ability increases exponentially.
The sun's variations can account for about half of the assumed warming if we take the average of TSI studies that show changes since 1700. the average of TSI studies has the change just over 0.2% of an increase. With the feedback response of the greenhouse effect, this change creates greater than 1 W/m^2 of warming into today. The IPCC low balls this from cherry picked studies that have small changes. Not only does the IPCC use less than 1/3rd the change of study averages, they do not acknowledge tithe the thermal inertia of the oceans that they have to go back past 1713 to have a valid baseline. Not 1750. Then on top of that, the IPCC only calculates the solar "direct effect" and not the heat increased through the greenhouse effect. Instead, they falsely attribute the solar feedback to greenhouse gasses.The sun creates climate let me know when you can control that. Climate change is a gig used as an excuse to expand government cnd control our lives. Not one dire prediction has ever come true so they move the goalposts every 10 years.
The IPCC is unscrupulous then their agenda.
Using the accepted earth energy budget, and the stated change at the TOA for a doubling, the surface warming only calculates to 0.5 degrees for a doubling of CO2. This is using the IPCC's own material. They like to pretend there is a huge feedback that will take the CO2 warming to rather high levels. This is impossible.
If there really was a greater than unity feedback to CO2, then we would go into a thermal runaway condition, and end up like Venus. But if this natural feedback were real without a hard limit, this would have occurred before we could ever stand erect.
If such a feedback exists, there has to be a maximum amplification from greenhouse gasses, and that means we would be at the maximum, with other factors modulating the temperatures.