This paper explains that the Snowball Hypothesis for Earth, which is a
theory speculating that the earth has experienced
consistent cyclical hot and cold periods, can be considered a possible cause of the current
trends toward warmer climates and rising seas. The author points out that the
theory encompasses tropical sea-level glaciers, distributions of continents, carbon dioxide levels, solar input, banded iron formations and early bacterial life. The paper states that scientist speculate that approximately twenty thousand years ago, our deep ocean waters moved towards the freezing point, but those water temperatures were not near the equator as was the case during the Neoproterozoic period.