N2O abatement on nitric acid lines (catalytic, very low €/t) and steam-side heat losses — both proven, both fast, both visible in the CBAM number.
From our guide: Decarbonizing Ammonia & fertilizers — 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: