Well let's look at the observed data?
Observational Assessment of Changes in Earth’s Energy Imbalance Since 2000
For greenhouse gases to cause warming, they would have to cause a positive energy imbalance in the longwave spectrum,
but the observed data from 2000 to 2024 is showing a Negative energy imbalance in the longwave spectrum.
People imply that when the phrase "Human activity" is used they mean added greenhouse gases,
but many Human activities can alter Earth's energy balance. Air Pollution and Land use changes,
and hypothetically added greenhouse gases. The problem is that there is no scientific experiment that has validated
that added greenhouse gases actually can cause warming.
The idea seems plausible, CO2 does absorb photons at 15 um, a window not covered by H2O,
but untested hypothesis, are not a basis for altering Human civilization, especially when the observed data
says the hypothesis is invalid.
If you look at the CERES data and it shows that our positive energy imbalance is happening in the ASR spectrum,
what does that tell you is the source of the increase? The Sun's output has not increased much,
yet the energy reaching the surface has increased by about 6 W m-2, As measured by the Baseline Surface Radiation Network (BSRN)
Global dimming and brightening: A review