People don't realize that the Earth gradually changes its orientation toward the Sun over long timescales through a process called axial precession. If you couple this with apsidal precession, you get a cycle of approximately 23,000–24,000 years, from glacial to interglacial periods.
This event is what causes abrupt climate change events every 3,000 years, with less severe events occurring roughly every 1,500 years, depending on Grand Solar Minima and geomagnetic excursions.
Current climate change is connected to this, and it's going to be brutal. The elites are preparing their doomsday bunkers for the period between 2030 and 2040.