100 years future the Global Warming, but further 100 years future the Next Ice Age. The global warming could be just a trigger to enter into the Next Ice Age. When such study report was announced, world big countries had an evil ambition to manipulate the global climate. Youich and Akane were co-working to seek for the archaea (ancient bacteria) which had synthesized the methane directly from CO2 to stop the global warming. But… ※この小説は拙著「深層海流：の英語版です。ただし、世界の近況に照らし大幅にリライトしています。