The International Thermonuclear Experimental Reactor program is one of the most ambitious energy projects in the world today. Multiple nations are collaborating to build the world's largest tokamak, a magnetic fusion device that has been designed to prove the feasibility of fusion as a large-scale and carbon-free source of energy. CGTN reporter Liu Jiaxin speaks with Sergio Orlandi, construction project head of the ITER Organization on the latest progress and China's contribution.