The video, discusses historical glacial cycles and their impact on sea levels over the past 800,000 years. The presenters analyze a graph based on oxygen isotopes from ice cores, which shows that the current sea level is close to the highest during this period, although historically such peaks did not last long. They suggest that humanity is nearing the end of the current interglacial period, pointing out that global cooling would be a greater threat than warming, due to the impact on agriculture and the ability to feed billions of people. This explanation refers to Milankovic cycles, including eccentricity, axis tilt and precession, as the main scientific cause of these dramatic climate changes.