British driver Andy Green, the first and only individual to break the sound barrier in a car, will attempt another land speed record this week at Utah's Bonneville Salt Flats. Twenty years ago, Green set the land speed record for a diesel-powered car, reaching 350.092 mph (563.4 kph). This time, he will drive a hydrogen-powered vehicle, the JCB Hydromax, aiming to showcase hydrogen as a clean energy alternative and beat his previous record. Green will compete against the world land speed records for hydrogen internal combustion engines (185.5 mph/298.5 kph) and electric vehicles (341.3 mph/549.2 kph). The retired Royal Air Force fighter pilot, now 64 years old, will return to the lunar-like landscape on Tuesday. JCB, a British construction equipment manufacturer, has invested over $134 million into hydrogen-powered engines and claims they emit no carbon dioxide from the tailpipes. However, the vast majority of hydrogen is currently produced from fossil fuels, raising concerns about its environmental impact. Green will face unique safety challenges due to the high pressure and flammability of hydrogen gas, but he has undergone rigorous testing and spent months learning how the car responds to various elements. The Bonneville Salt Flats, a remnant of a prehistoric lake bed, have drawn generations of drivers seeking to set new land speed records since 1914. Green's attempt comes a year after a fatal accident during Speed Week in 2021, underscoring the risks involved in high-speed racing.