What physical evidence supports the contention that carbon dioxide emissions from burning fossil fuels are the principal cause of global warming since 1970?
If you have it....lets see it. If you don't....then lets hear your best excuse for not providing it.
There is no such published paper of EMPIRICAL based research to support it. If there were, there wouldn't be HUNDREDS of
NEW climate models, with
NEW emission scenarios be published every 5 years in the IPCC report.
There are many published papers using a lot of unverified modeling constructs, which means a lot of assumption, Kridging and infilling to make a half baked premise that CO2 is the dominant source of warming since the 1970's. It is IMPOSSIBLE since the increase of energy outflow from the planet always exceeds the postulated warm forcing increase of CO2.
CO2 absorb and release IR energy, no heat is produced in the process, no change at all in its energy state if it emitted the same way it was absorbed.
Climate models do NOT have demonstrated forecast skill, which is why every 5 years we get a new 100 + climate models in the IPCC report, it has become a waste of time continuing this line of failures. It is now a money trail and nothing more.