Fuel-side: kiln efficiency, biomass blending, heat recovery and insulation of kiln services — the process share waits for capture, the fuel share doesn't.
From our guide: Decarbonizing Lime — 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: