You need to get off that fence and made a decision...the data in that chart is as accurate as is humanly possible...especially the most recent measurements which literally no one disputes. We are headed deeper and deeper into an environmental regime that this planet hasn't seen for 800,000 years...numerous Ice Ages came and went when CO2 concentrations varied from 180 - 300 ppm...we're climbing through the 416 ppm mark with no end in sight...in a relative 'millisecond' historically.
As I've also mentioned, our Fossil Fuels are vital for all sorts of uses beyond just burning them for heat and power...yet they are truly "Finite" and will not last for hundreds of years. We have alternatives now...we need to transition in earnest to Nuclear Power and Renewables...ASAP...and acknowledge that the process will take a couple of decades, at best, to complete.