Speaker
Description
The WLCG Sustainability Forum was set up in the summer of 2025, to build on the momentum generated by the WLCG Sustainability Workshop in December 2024 and the WLCG workshop plenary session on sustainability in April 2025. In this presentation we review the topics covered in the approximately monthly meetings and highlight community progress towards a better understanding of how to deliver LHC computing in the most sustainable manner. We consider progress in terms of the four-M’s that underpin these efforts: Measure, Model, Monitor, and eventually Moderate carbon impact. The first of these refers to the ability to measure power-usage from both the job, and the facility, sides and translate that information into a meaningful carbon footprint. With sufficiently granular data, carbon-models can be developed to inform users and facilities, and longer-term monitoring can be implemented, which should lead to moderation of the carbon footprint. As power supplies become less carbon-intense, the impact of embodied-carbon becomes increasingly important, leading to an evolving optimisation of hardware lifetime and utilisation. Finally, we note that storage is a significant part of the equation that must also be addressed. This presentation is intended as an overview of community work, setting the scene for more detailed presentations on individual topics, but will consider what we have learnt so far, and the future directions.