CSPs are under pressure to reduce Scope 3 emissions by embedding sustainability across every customer interaction. In Phase I, this Catalyst established a conceptual design for a platform that promotes low-carbon choices. Phase II builds on that foundation with a working solution powered by TM Forum Open APIs and genAI to drive sustainable decision-making in real time. This phase focuses on operationalizing carbon visibility in both digital and assisted channels. In digital journeys, the platform uses genAI to suggest lower-emission products, plans, and services based on user preferences. It integrates carbon metadata into product catalogs, so customers can compare environmental impact during checkout or upgrades. Refurbished product promotions, optimization tips, and device take-back signups also feature directly in the flow. In assisted channels, agents receive real-time CO₂ data and intelligent recommendations. They can guide customers toward more sustainable choices using monthly usage reports, charging patterns, and predictive emissions forecasts. This encourages ongoing behaviour change and fosters deeper engagement. To support scalability, the team is expanding TM Forum Open APIs with carbon data fields. This enables standardized integration of emissions insights across systems, laying the groundwork for broader industry collaboration and transparency. The technical delivery of Phase II moves the Catalyst focuses on linking emissions data with commerce, care, and catalogs. CSPs gain tools to influence purchase behavior, reduce environmental impact, and unlock new forms of customer value. This Catalyst demonstrates that sustainability can be more than a reporting obligation. It can become a differentiator—deeply integrated into user journeys and built on industry standards. With a working platform in development, CSPs can finally focus not just on climate goals, but impact too.