Abstract: [Task] Provided is a manufacturing method of butadiene that can reduce carbon dioxide emissions. [Solution] A manufacturing method of butadiene includes an electrolytic reduction process 2 that produces ethylene and oxygen from carbon dioxide and water as a raw material by electrolytic reduction, a butene producing process 3 that produces butene by dimerizing the ethylene produced in the electrolytic reduction process, a mixing process 4 that prepares a mixed gas by mixing the oxygen produced in the electrolytic reduction process, the butene produced in the butene producing process, and air, and a butadiene producing process 5 that produces butadiene by heating the mixed gas and oxidatively dehydrogenating the butene, wherein carbon dioxide by-produced in the butadiene producing process is used as a portion of the raw material in the electrolytic reduction process.

Abstract: A seatbelt fastening prompting apparatus comprises a display device of driving assistance information which displays driving assistance information on a screen, a seatbelt fastening detection device which detects a fastening situation of a seatbelt as to whether the seatbelt is fastened or unfastened, a vehicle speed detection device which detects a vehicle speed, and a control device which allows the screen to display warning contents to the effect that the seatbelt should be fastened, when an ignition switch is turned on and the seatbelt is detected as being unfastened by the seatbelt fastening detection device. In the seatbelt fastening prompting apparatus, the warning contents are changed to raise a warning level thereof step by step in accordance with the vehicle speed.

Abstract: A seatbelt fastening prompting apparatus comprises a display device of driving assistance information which displays driving assistance information on a screen, a seatbelt fastening detection device which detects a fastening situation of a seatbelt as to whether the seatbelt is fastened or unfastened, a vehicle speed detection device which detects a vehicle speed, and a control device which allows the screen to display warning contents to the effect that the seatbelt should be fastened, when an ignition switch is turned on and the seatbelt is detected as being unfastened by the seatbelt fastening detection device. In the seatbelt fastening prompting apparatus, the warning contents are changed to raise a warning level thereof step by step in accordance with the vehicle speed.