TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Components: When the liquefied carbon dioxide is discharged to the ocean as a droplet, a diluted diffusion is carried out and the liquefied carbon dioxide is dissolved in seawater. The droplet of liquefied carbon dioxide is discharged in the depth of 500 m or more in the ocean. The floating material-type power generating plant further consists of slurry generator, seawater heat exchangers (H1) which cools the carbon dioxide in seawater, seawater heat exchangers (H2) which heats the liquefied natural gas in seawater, cold utilization portion which cools liquefied natural gas supplied from the LNG tank, cooling-heat electric power generation system which produces electric power by driving a rotational drive engine by Rankine cycle or Stirling cycle which cools the working medium by liquefied natural gas while heating a working medium by seawater, and liquefaction carbon dioxide tank in which carbon dioxide is stored, cooled and liquefied by the heat exchanger. The slurry generator provides slurry-form liquefied carbon dioxide (F42) by mixing liquid carbon dioxide and solid carbon dioxide by cooling the carbon dioxide which is installed in the floating material, and liquefying in the heat exchanger. The slurry drop of liquefied carbon dioxide is discharged in the depth of 200 m or more in the ocean. The slurry-form liquefied carbon dioxide in the heat exchanger is cooled to a freezing point with cooling-heat and heat of vaporization of liquefied natural gas supplied from the LNG tank. The seawater heat exchanger (H1) is installed in the floating material and the carbon dioxide is recovered by the carbon dioxide recovery apparatus. In the heat exchanger, the heat exchange is performed between the carbon dioxide cooled by the seawater heat exchanger (H1), and the liquefied natural gas supplied from the LNG tank. The seawater heat exchanger (H2) is installed in the floating material and heat exchange is performed. The electric power generation system produces natural gas by heating the liquefied natural gas in seawater heat exchanger (H2). The cold utilization portion, liquefaction carbon dioxide tank and cooling-heat electric power generation system are installed in the floating material. The electric power generation system is heated using a portion of liquefied natural gas cooled in the cold utilization portion. The cooling-heat electric power generation system cools the working medium by the liquefied natural gas supplied from the LNG tank. The liquefied natural gas heated by the electric power generation system is used in the cooling-heat electric power generation system during cooling working medium as natural gas. In the heat exchanger, the heat exchange between the carbon dioxide recovered by the carbon dioxide recovery apparatus and the liquefied natural gas supplied from the LNG tank is performed using intermediate thermal medium. The carbon dioxide discharge portion discharges the carbon dioxide stored in the liquefaction carbon dioxide tank to the ocean. The slurry-form carbon dioxide is stored in the liquefaction carbon dioxide tank. Preferred Condition: The droplet of liquefied carbon dioxide has temperature of -26 degrees C or less. Preferred Properties: The diameter of the droplet of liquefied carbon dioxide is 0.7 m or more. The diameter of the slurry drop of liquefied carbon dioxide is 0.4 m or more.