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LTC initiated its carbon management by establishing baselines and has achieved a reduction of nearly two-thirds, aiming for a 70% decrease from the original baseline. The Development Consent Order mandates legal commitments for carbon and biodiversity, integrating sustainability into the project’s framework.

Diesel-powered equipment is being replaced with electric and hydrogen alternatives, alongside on-site hydrogen generation and renewable energy. The project is also implementing lower carbon ground treatment and soil mixing techniques.

Tunnel arisings are being repurposed for landscaping, with habitat creation initiatives supporting migratory bird species. Early archaeology programming aims to mitigate carbon-intensive disruptions. A low carbon footbridge design contest is ongoing, and carbon education is being provided to suppliers to promote sustainable practices.