descarbonizar

To decarbonize — historically a mechanical term for removing carbon buildup from an engine, but today overwhelmingly used in its much bigger contemporary sense: reducing carbon emissions from an economy, industry, or energy system. Extremely common in current climate and energy policy writing.

• El país se comprometió a descarbonizar su economía para 2050. — The country committed to decarbonizing its economy by 2050.
• Descarbonizar el transporte es clave para reducir emisiones. — Decarbonizing transportation is key to cutting emissions.
• Los mecánicos antiguos descarbonizaban el motor periódicamente. — Old-school mechanics used to decarbonize the engine periodically.

Most learners will encounter this almost exclusively in its modern climate-policy sense — the older 'clean carbon out of an engine' meaning still exists but is comparatively rare today.