I don't claim to be knowledgable enough to give a thesis for critique.

My question would be, however, that if the data from 700,000 years has episodes that prove the existence of a "tipping point", how many of those episodes were caused by the burning of fossil fuels? How many of those episodes caused the end of the world?

How can you not accept that the earth's climate goes through cycles, which are neither understood nor predictable?