Definition of decarbonizing:
(v) :
(transitive, intransitive) To reduce or replace fossil fuels by renewable energy in energy production and distribution systems.
(v) :
To remove carbon from something.
(v) :
(transitive) To clean hard sooty deposits from inside an internal combustion engine.
(v) :
(transitive) To remove carbon content from iron or steel, either intentionally or accidentally, as by (for example) overheating steel in the presence of air, destroying its former temper and hardness.