Did we already "break" the Earth ?

And time for another installment in the series "Common Sense, Uncommon Thinking".
This time it is about good news on the Climate Change front and it is that if you are "against fossil fuels" then celebrate because their days are without question numbered. The very definition of fossil fuels is that they are not renewable, they are finite, there is some quantity of them still left and nobody is making any more of them.
So the fossil fuels that exist today will be "brought up" and burned sooner or later. There is no doubt about that so why waste time focusing on it and focusing on what is fundamentally a "self-correcting problem". There may be debate over where they get burned and over what period of time but used up they will be. And then they will be done, for a few Millennia at least.
The relevant next question then is has the Earth already been "broken"? Has the planet already passed the point of no return and we are doomed to die a hot and wet death or is it likely that we have not "broken" this planet, that has been around for 7 Billion years, during the last 50 years?
Recent studies have shown that as CO2 concentrations increased so has the Earth's absorption of it. As we continue to burn up fossil fuels in the next couple of decades the CO2 levels are likely to increase further but will this be enough to bring about catastrophic 2nd level consequences (CO2 concentrations alone don't damage anything - if they cause temperatures to rise, that may cause other things and so on)? Nobody knows and I surely do not claim to know.
But is it likely that we have already damaged Earth beyond repair or that the Earth will not have a massive spasm from what transpired in the last 50 years? If you had to go with one of those which do you think is more likely.

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