There's a lot of evidence that:

* mankind is putting a lot of CO2 in the atmosphere
* CO2 levels are currently rising
* CO2 contributes to the green-house effect, which contributes to increase earth temperature
* the earth temperature has been increasing in the past decades

There's also evidence that:

* CO2 levels have been going up and down for as long as we can look at them without human intervention. E.g. [this NASA graph](https://climate.nasa.gov/climate_resources/24/) spanning 400.000 years
* global temperature is still inside the bounds of normal cyclical Holocene variations (as seen on [wikipedia](https://en.wikipedia.org/wiki/Geologic_temperature_record))
* earth temperature has been going up and down for millions of years, obviously without human intervention, as seen on the same Wikipedia page

The first set of facts I listed proves without a doubt that some of our activity is causing an increase of temperature of some unknown magnitude, but not much more. When confronted with the second set of facts I listed, scientists usually reiterate the first four facts, and add that there's a huge consensus among scientists (97% !) that human activity is the main driver of climate change, which is certainly the case, but is obviously not a proof.

They also say that reducing our CO2 emissions won't hurt anyway and that a 2 °C temperature increase would be catastrophic. This is a very good reason to act, but this still doesn't prove anything.

Digging in the research, the main evidence I've seen relies on the fact that our models can't explain the current change in temperature without taking into account human activity. When opposed that those models could be wrong, the usual answer is that we know they work because they explain past changes, but this not a very strong point since those models have been calibrated using past data (in the financial world, this is a well-known issue with models trying to predict stocks changes)

The other piece of evidence is that the other factors *we know about* (solar activity, volcano activity, changes in earth orbit, deforestation changing the energy reflected by some of the landmass, human-released aerosols reflecting more energy, etc... ) don't seem to be behind the recent increase in temperature. So the increase must be mainly caused by the anthropogenic CO2 , for lack of a better explanation. This is a strong point, but isn't a proof per se.

Are there other, possibly stronger points to support the claim that the CO2 human activity is releasing in the atmosphere is the main driver of climate change?