The "Ultra-Carbon No. 1" sintering-waste-heat project in Guizhou uses steel sintering off-gas that already contains 14–18 % CO₂. The system compresses this entire exhaust stream back into its closed loop and publicly claims an "annual CO₂ reduction of 128 500 t." In reality, it simply captures the gas that would have been vented and re-uses it within the cycle; the CO₂ is not destroyed.