Off the coast of Ikitsuki Island, Nagasaki Prefecture, there is an artificial upwelling structure designed as a pilot project of the Fisheries Agency, where results such as the formation of a new fishing ground for sardines and the making of an offshore fishing ground are forthcoming.In addition to these merits, it should contribute to the reduction of CO2 in the atmosphere, because marine snow which yields CO2 accumulates for ages in the sea and its deep layers.