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(240423) -- HANNOVER (GERMANY), April 23, 2024 (Xinhua) -- A visitor looks at a bicycle made of recycled plastics at Hannover Messe in Hannover, Germany, on April 22, 2024. Hannover Messe 2024, Germany's leading industrial trade fair, kicked off on Monday with a clear emphasis on carbon-neutral production and hydrogen fuel cells. (Xinhua/Ren Pengfei) (KEYSTONE/XINHUA/Ren Pengfei)