Climate is changing. So I guess you're saying never.
Relations and Implications of Aperiodic Earth Core / Geomagnetic Field Reversals with Earth Glaciations
more solar maximum, galactic-cosmic radiation flux (GCRF) reaches the planet and produces global warming, on top of anthropocentric global warming contributions,
Increased levels of solar and cosmic energy variations of 3%, at the earth’s surface are critical to all life. • Cosmic coldness breaching the earth’s magnetic field results in a long geological ice age in the form of snowball earth or icehouse earth.