LONDON—Britain’s meat processors will start running out of carbon dioxide (CO2) within five days, forcing them to halt production and impacting supplies to retailers, the industry’s lobby group warned on Monday. A jump in gas prices has forced several domestic energy suppliers out of business and has shut fertilizer plants that also make CO2 as a by-product of their production process. The CO2 gas is used to stun animals before slaughter, in the vacuum packing of food products to extend their shelf life, and to put the fizz into beer, cider, and soft drinks. CO2’s solid form is dry ice, which is used in food deliveries. The CO2 crisis has compounded an acute shortage of truck drivers in the UK, which has been blamed on the impact of COVID-19 and Brexit. “My members are saying anything between 5, 10, and 15 days supply (remain),” Nick Allen of the British Meat …