We know the upper and lower limits at which our form of life thrives and survives. Using that as a measurable standard, we can determine whether a certain change in climate is, or is not, a threat.
For instance, we know that the Maunder Minimum brought such extreme cold to the northern hemisphere, that millions suffered and died from starvation. We're now entering a similar solar minimum, and can predict with certainty that there will be crop failures and economic dislocations on a massive scale over the coming decades.
Of course , those examples are not man made so there is nothing we can do. While we are at the bottom of solar cycle 24 this is hardly the Maunder Minimum. The bottom of the ordinary cycle happens every 11 years.There is no scientific conclusion or even hypothesis that this is the “ maunder Minimum” . No the “climate Change “ lie is orthadoxy in a religious movement based on factless faith.