Fossil CO2 is ≈0.3–0.6 t/t paper because much energy is self-generated biomass; the fossil share concentrates in lime kilns, gas boilers and drying.
From our guide: Decarbonizing Pulp & paper — full context, charts and sources there.
Boilers, kilns, heat exchangers, valves and steam lines lose energy continuously. Inzonex makes patented (UK GB2508992.1) removable modular insulation — snap-fastened covers engineered per temperature tier, not generic off-the-shelf jackets: