Ruhrgebiet produces 16 million tons raw steel yearly, 43% of Germany's total. German steel causes 7% of national CO2 emissions. Industry suffers from Chinese low-cost competition. US imposes tariffs hitting German exports. Hydrogen summit in Duisburg aims for climate-neutral blast furnaces. Coal and coke furnaces targeted for dirty emissions overhaul. Chancellor to invite steelmakers soon. Chinese five-year plan boosts their planned economy power. US tariffs Africa while China opens markets strategically. Few countries profit from China trade shift.