Google Cloud Well-Architected Framework skill for the Sustainability pillar

Overview

The Sustainability pillar of the Google Cloud Well-Architected Framework
provides principles and recommendations to help you minimize the environmental
impact of your cloud workloads. It focuses on a shared responsibility
model—Google optimizes the sustainability of the cloud, while customers
optimize sustainability in the cloud. By making informed decisions about
architecture, resource allocation, and region selection, you can significantly
reduce your carbon footprint and improve overall energy efficiency.

Core principles

The recommendations in the sustainability pillar of the Well-Architected
Framework are aligned with the following core principles:

• Shared responsibility: Define the boundaries of responsibility and
  embrace a shared fate model, working with your cloud provider and partners
  to achieve optimal environmental outcomes for the entire ecosystem.
  Grounding document:
  https://docs.cloud.google.com/architecture/framework/sustainability.md.txt

• Use regions that consume low-carbon energy: Prioritize Google Cloud
  regions with a high percentage of Carbon-Free Energy (CFE) and "Low CO2"
  indicators to lower the gross carbon emissions of your deployments.
  Grounding document:
  https://docs.cloud.google.com/architecture/framework/sustainability/low-carbon-regions.md.txt

• Optimize AI and ML workloads: Maximize computations per watt by matching
  algorithmic needs to specialized hardware (like TPUs) and applying
  mathematical techniques to reduce computational complexity. Grounding
  document:
  https://docs.cloud.google.com/architecture/framework/sustainability/ai-ml-energy-efficiency.md.txt

• Optimize resource usage: Eliminate energy waste by scaling resources to
  zero when idle, rightsizing virtual machines, and prioritizing managed
  services that dynamically match actual demand. Grounding document:
  https://docs.cloud.google.com/architecture/framework/sustainability/optimize-resource-usage.md.txt

• Develop energy-efficient software: Design your applications to minimize
  unnecessary CPU, memory, and network activity on both backend servers and
  end-user devices by using event-driven logic and optimized assets. Grounding
  document:
  https://docs.cloud.google.com/architecture/framework/sustainability/energy-efficient-software.md.txt

• Optimize data and storage: Reduce the environmental footprint of your
  storage by implementing lifecycle management to archive cold data and
  eliminating "dark data" that provides no business value. Grounding document:
  https://docs.cloud.google.com/architecture/framework/sustainability/optimize-storage.md.txt

• Continuously measure and improve: Gain visibility into your carbon
  emissions by analyzing granular data, identifying hotspots, and taking
  proactive steps to remediate inefficiencies. Grounding document:
  https://docs.cloud.google.com/architecture/framework/sustainability/continuously-measure-improve.md.txt

• Promote a culture of sustainability: Embed sustainability into your
  organizational governance, connect technical decisions to environmental
  goals, and ensure staff have the skills to implement green practices.
  Grounding document:
  https://docs.cloud.google.com/architecture/framework/sustainability/culture.md.txt

• Align sustainability practices with industry guidelines: Ensure that
  your sustainability initiatives are aligned with industry guidelines for
  measurement, reporting, and verification, such as W3C Web Sustainability
  Guidelines, Green Software Foundation, and Greenhouse Gas Protocol.
  Grounding document:
  https://docs.cloud.google.com/architecture/framework/sustainability/industry-guidelines.md.txt

Relevant Google Cloud products

The following are examples of Google Cloud products and features that are
relevant to sustainability:

• Visibility and measurement:

  • Carbon Footprint: Provides dashboard visibility into greenhouse gas
    emissions associated with Google Cloud usage.
  • BigQuery: Analyzes exported Carbon Footprint data alongside billing
    data to identify emission hotspots.

• Infrastructure and operations:

  • Google Cloud Region Picker: Helps weigh carbon footprint, cost, and
    latency when selecting deployment locations.
  • Active Assist / Recommender: Automatically identifies idle resources
    and provides VM rightsizing recommendations to reduce waste.
  • Cloud Run / GKE Autopilot: Fully managed compute environments that
    optimize cluster usage and can scale to zero when idle.
  • Cloud Batch: Optimizes the scheduling of batch jobs, allowing
    execution during periods of high Carbon-Free Energy.
  • Spot VMs: Utilizes unused data center capacity for fault-tolerant
    workloads, improving overall hardware efficiency.

• Data and AI:

  • Cloud Storage Lifecycle Management: Automatically transitions older
    data to lower-energy storage classes (Nearline, Coldline, Archive).
  • Cloud TPUs: Specialized hardware optimized for the energy efficiency
    of large-scale AI/ML matrix multiplications.

Workload assessment questions

Ask appropriate questions to understand the sustainability-related requirements
and constraints of the workload and the user's organization. Choose questions
from the following list:

• Cloud sustainability:

  • How do you define the boundaries of sustainability responsibility
    between your organization and your cloud provider?
  • How do you leverage cloud capabilities and AI to drive sustainability
    outcomes for your broader business operations?
  • How does your cloud strategy account for the sustainability impact of
    your partner ecosystem and multi-cloud environments?

• Use regions that consume low-carbon energy:

  • How do you incorporate carbon intensity into your Google Cloud region
    selection strategy?

• Optimize AI and ML workloads:

  • How do you optimize the energy efficiency of your AI and machine
    learning lifecycles?

• Optimize resource usage:

  • How do you ensure your infrastructure footprint dynamically matches
    actual workload demand?
  • How do you select and maintain the hardware types used for your cloud
    workloads?
  • What is your strategy for handling non-urgent or compute-intensive
    background tasks?
  • How do you balance the need for high availability and disaster recovery
    with sustainability?

• Develop energy-efficient software:

  • How do you ensure your backend logic minimizes unnecessary CPU, memory,
    and network activity?
  • How do you manage the overall efficiency and maintenance of your
    codebase for sustainability?
  • How do you minimize the data volume and processing load that your
    application places on end-user devices?
  • How does your user experience (UX) design contribute to energy
    efficiency for the end user?

• Optimize data and storage:

  • What process do you have for managing the environmental footprint of
    your data and storage?

• Continuously measure and improve:

  • How do you analyze your carbon data to prioritize optimization efforts?
  • How is sustainability measurement embedded into your organization’s
    governance and culture?
  • What is your current process for gaining visibility into your
    cloud-related carbon emissions?
  • What proactive steps do you take to remediate identified carbon
    hotspots?

• Promote a culture of sustainability:

  • How do you connect individual technical decisions to the organization's
    mission and hold teams accountable for results?
  • How do you ensure your technical and business staff have the specific
    skills required to implement sustainability practices?

Validation checklist

Use the following checklist to evaluate the architecture's alignment with
sustainability recommendations:

• Cloud sustainability:

  • [ ] The organization embraces a shared responsibility and shared fate
    model for sustainability.
  • [ ] AI is used as a catalyst for profitability and resilience to
    streamline operations, or sustainability is integrated into the design
    process to create positive feedback loops.
  • [ ] Collaborations with sustainable partners are prioritized and
    multi-cloud data portability is leveraged, or internal practices align
    with recognized global standards like the Green Software Foundation.

• Use regions that consume low-carbon energy:

  • [ ] A data-driven policy prioritizes regions with high Carbon-Free
    Energy (CFE%) and "Low CO2" indicators, or the Google Cloud Region
    Picker is actively used to balance carbon footprint with cost and
    latency.

• Optimize AI and ML workloads:

  • [ ] Algorithmic needs are matched to specialized hardware (TPUs) to
    maximize computations per watt, or mathematical techniques like model
    compression and PEFT are applied to reduce computational complexity.

• Optimize resource usage:

  • [ ] Fully managed services that scale to zero when idle are utilized, or
    Horizontal Pod Autoscaling (HPA) and Vertical Pod Autoscaling (VPA) are
    used in GKE to prevent over-provisioning.
  • [ ] A formal process exists to upgrade to the newest machine types for
    improved performance-per-watt, or workloads are actively matched to
    specialized machine families.
  • [ ] Batch jobs are proactively scheduled to run during periods or in
    regions with the highest proportion of CFE, or Spot VMs are utilized for
    non-critical batch jobs.
  • [ ] "Cold DR" or serverless failover is prioritized to ensure secondary
    regions remain at zero energy consumption until an event occurs, or
    Infrastructure as Code (IaC) is used to rapidly provision a recovery
    environment only when needed.

• Develop energy-efficient software:

  • [ ] Resource-intensive busy loops or constant polling are replaced with
    event-driven logic, or algorithms with optimal time complexity and data
    structures are prioritized.
  • [ ] The "Don't Repeat Yourself" (DRY) principle is adhered to with
    regular refactoring, or intelligent caching (e.g., Memorystore) is
    implemented with smart eviction policies.
  • [ ] The download size of website products is measured and maintained
    against a strict budget, or CI/CD pipelines automate the minimization
    and compression of HTML, CSS, and JS files.
  • [ ] Static sites or Progressive Web Apps (PWAs) are preferred for faster
    loading, or DOM manipulation is minimized to reduce device power
    consumption.

• Optimize data and storage:

  • [ ] Object Lifecycle Management is used to automatically move cold data
    to Archive storage, or discovery techniques (e.g., Dataplex) are used to
    identify and eliminate "dark data".

• Continuously measure and improve:

  • [ ] Carbon data is analyzed by project, region, and service to identify
    gross emitters, or carbon data is joined with Billing data in BigQuery
    to correlate cost and environmental impact.
  • [ ] A formal GreenOps function defines accountability for carbon
    reduction targets, or verified Carbon Footprint data from BigQuery
    supports formal ESG disclosures.
  • [ ] Applications are instrumented to measure the specific carbon
    intensity of software features, or automated exports of Carbon Footprint
    data to BigQuery are configured for deep analysis.
  • [ ] The unattended project recommender and Active Assist are regularly
    used to decommission idle resources, or proactive projects re-architect
    hotspots by shifting workloads to low-carbon regions.

• Promote a culture of sustainability:

  • [ ] Abstract carbon metrics are transformed into tangible progress
    indicators in annual reports, or sustainability is treated as a
    first-class technical requirement (NFR) tied to KPIs and performance
    reviews.
  • [ ] Training tailored to specific job roles (e.g., developers on code
    efficiency, FinOps on carbon unit economics) is provided, or teams are
    formally trained to access and interpret carbon footprint data.