(FILES) An employee works on an assembly line at the Intuis heat pump manufacturing plant in Feuquieres-en-Vimeu, northern France on October 2, 2023. ‘It's impossible. We'll never go to zero fuel oil": in Bourgogne-Franche-Comte, the region that heats most with fuel oil, people are working hard to install electric heat pumps, but the "good old fuel oil" is having a hard time of it. (Photo by Denis Charlet / AFP)