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Green Software Foundation
Members Only
Completed
New Standard

SCI for Web

Extending the SCI to the Web, addressing the challenges of measuring website emissions

Deliverable
Standard
Purpose
New Standard
Stage
Selection
Start Date
16 September 2025
End Date
17 December 2025
Applications Open
11 August 2025
Application Deadline
12 September 2025
Seats
20

Extending the Software Carbon Intensity specification to the Web

Websites and web applications are everywhere. But measuring their carbon emissions is surprisingly tricky. Server-side rendering, client-side JavaScript, CDNs, third-party scripts, caching strategies. The web stack is complex, and there's no agreed standard for how to calculate the carbon intensity of a web experience. This assembly aims to change that by extending the SCI specification to cover web-specific use cases.

This assembly will bring together web sustainability experts, front-end and back-end engineers, sustainability practitioners, and standards enthusiasts to collaboratively develop a Standard Requirements Document for an "SCI for Web" specification. Over a series of structured sessions, participants will define the software boundaries for web systems, identify appropriate functional units, and draft the requirements that will guide formal specification development.

All work will take place on GitHub, with facilitated sessions for collaborative problem-solving. You'll be building on the existing SCI specification and the lessons learned from previous assemblies, so the process is well-established and the facilitation is experienced.

If you work in web development, web performance, digital sustainability, or standards and you want to help define how the industry measures website emissions, this assembly needs your expertise.

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