The cause is the burning of fossil fuels. We can tell that the added CO2 in the atmosphere has lower C14. Because it is millions of years old and already all decayed to C12.
Explain why most astronomers are actually saying it"s because of the sun being in a super phase? Why nobody let them talk in the news?
That is actually denier propaganda. Astronomers actually debunked that it isn't caused by solar cycles since those cycles do not at all correlate to the changes in the climate.