A worker welds metal rods at the construction site for the Greensand CO2 Terminal in the Port of Esbjerg, Denmark, expected to be completed in spring 2026. In the North Sea where Denmark once drilled for oil, imported European carbon dioxide will soon be buried under the seabed in a carbon capture and storage (CCS) project nearing completion. CCS technology is one of the tools approved by the UN's Intergovernmental Panel on Climate Change (IPCC) and the International Energy Agency (IEA) to curb global warming, especially for reducing the CO2 footprint of industries like cement and steel that are difficult to decarbonise. Sourced mainly from biomass power plants, liquefied CO2 will be shipped from Europe via the Esbjerg terminal in southwestern Denmark to the Nini platform above an empty oil reservoir, into which it will be injected. (Photo by Jonathan NACKSTRAND / AFP via Getty Images)