地球史から見た資源および環境問題

Abstract

The Earth has evolved since the birth at 4.6 Gy B. P. Especially, the evolution has been remarkable on the surface that is the boundary between the fluid sphere and the solid sphere. Many kinds of mineral and fuel deposits were formed in the process of the evolution, and are used as resources by human being. For most of the resources, reproduction rates in the Earth's history are slower than consuming ones in the human activity. This is the resources problem. All of the materials mined are dumped after using them. This process is a bypass which is added on the material cycle in the Earth. The bypass changes the evolution of the Earth. This is the environmental problem. The increasing carbon dioxide is one of the big environmental problems. In order to solve the problem many ideas are proposed, such as fixing by calcium carbonate, deep-sea disposal of liquid carbon dioxide, fixing by carbon dioxide hydrate, and storage in abandoned natu al gas reservoir. Any idea among them has not been evaluated from the viewpoint of the Earth's history. The lack of the evaluation based on this point of view should not guarantee the safety of the disposal processes of carbon dioxide.