We have had extreme climate before, a few degrees up and down are not new (ice age(s).
Just because someone with a motive says this has never happened before, does by no means, mean it has never happened before.
The earth is completely indifferent to maintaining a climate that we enjoy. It copes just fine with anything that comes it's way. How much of your freedom and life style would you sacrifice for an extra day, week, year, 50 years?
Have no doubt, before the earth is gone, and the sun doesn't shine, there will be a climate here that is not compatible with human life. It will not matter how much of your money and freedom you are willing to forfeit.
best,
ed