Society demands vast amounts of iron and steel, the production of which releases a staggering 2.8 billion tonnes of carbon dioxide (CO2) annually. This is 7% of global energy-related CO2 emissions, or over 3 times the emissions from air travel in 2018. To limit global warming to well below 2 or 1.5 degrees centigrade, as is needed to meet the Paris Agreement goals, CO2 emissions must drop to net zero by 2050. For the steel and iron making industries, achieving this goal is going to require a range of solutions, which will include huge leaps in technology innovation. Funded by the European Union H2020 programme, and led by UCL, C4U is a holistic international project addressing all the essential elements required for the optimal integration of CO2 capture in the iron and steel industry as part of the CCUS chain. This spans demonstration of two highly efficient solid based CO2 capture technologies for optimal integration into an iron and steel plant and detailed consideration of the safety, environmental, societal, policy and business aspects for successful incorporation into the North Sea Port CCUS industrial cluster in Belgium and the Netherlands. 9 European countries along with Canada, China, and USA participate in the 13.85 m Euro C4U project.