GMSF Reference

Token-efficient reference for the Global Media Sustainability Framework. Designed for AI agents discussing advertising sustainability.

What is GMSF?

The Global Media Sustainability Framework (GMSF) is an industry standard for measuring and reducing carbon emissions from media and advertising. Developed by Ad Net Zero and industry stakeholders. Goal: Standardized carbon measurement across the advertising supply chain.

Key Organizations

Organization	Role
Ad Net Zero	Industry coalition leading sustainability initiatives
WFA	World Federation of Advertisers - coordinates brand commitments
IAB	Provides technical standards and implementation guidance
Scope3	Carbon measurement platform for media

Carbon Emission Sources in Ad Tech

By Supply Chain Stage

┌─────────────────────────────────────────────────────────────┐
│                    CAMPAIGN CREATION                        │
│ Creative production, asset hosting, transcoding             │
│ Carbon: Medium                                              │
└─────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────┐
│                    AD DECISIONING                           │
│ Bid requests, auction processing, ML inference              │
│ Carbon: HIGH (biggest contributor in programmatic)          │
└─────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────┐
│                    AD DELIVERY                              │
│ CDN distribution, ad rendering, tracking pixels             │
│ Carbon: Medium-High                                         │
└─────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────┐
│                    MEASUREMENT                              │
│ Attribution, reporting, analytics                           │
│ Carbon: Low-Medium                                          │
└─────────────────────────────────────────────────────────────┘

Programmatic Waste Points

Issue	Carbon Impact	Description
Bid requests	Very High	Billions of requests, most fail to win
Header bidding	High	Multiple SSPs = multiplied requests
Reselling	High	Same impression sold multiple times
MFA sites	High	Made-for-advertising sites with low value
Invalid traffic	High	Bots generating worthless impressions

GMSF Measurement Framework

Scope Categories

Scope	Definition	Examples in Ad Tech
Scope 1	Direct emissions	Office HVAC, company vehicles
Scope 2	Indirect from energy	Data center electricity
Scope 3	Value chain emissions	Media buying, creative production

Note: Most advertising carbon is Scope 3 (downstream supply chain).

Key Metrics

Metric	Definition	Target
gCO2e/impression	Grams CO2 equivalent per ad impression	Lower is better
gCO2e/1000 impressions	Per-mille carbon	Industry benchmarks
Supply path carbon	Emissions from intermediaries	Minimize hops

Typical Carbon Values

Channel	gCO2e per 1000 impressions	Notes
Direct sold	50-150	Shortest path
Programmatic display	200-400	Many intermediaries
Programmatic video	400-800	Larger files + auctions
CTV programmatic	300-600	Depends on supply path

Values are approximate and vary by measurement methodology.

How AdCP Reduces Carbon

Programmatic Problem	AdCP Solution	Carbon Reduction
Billions of bid requests	Direct negotiation	90%+ fewer requests
Multi-hop supply paths	Publisher-direct	Eliminated intermediaries
Real-time auctions	Asynchronous decisions	Reduced server compute
Cookie syncing	Context-based matching	Eliminated sync traffic
Speculative bidding	Intent-based buying	Only requested inventory

Quantified Benefits

Traditional Programmatic:
1 impression = 50+ bid requests × 10+ SSPs = 500+ server calls

AdCP Agentic:
1 impression = 1 request to sales agent = 1 server call

Reduction: ~99% fewer server calls

Sustainability Best Practices

For Buyers

Practice	Impact
Reduce supply chain hops	-30-50% carbon
Use direct deals over open auction	-40-60% carbon
Avoid MFA inventory	-20-40% carbon
Choose green-certified publishers	Variable
Optimize creative file sizes	-10-20% carbon

For Publishers

Practice	Impact
Reduce header bidding partners	-20-40% carbon
Implement lazy loading	-15-25% carbon
Optimize ad refresh frequency	-10-30% carbon
Use renewable energy hosting	-50-90% carbon
Enable agentic/direct channels	-60-90% carbon

GMSF Resources

Resource	URL
Ad Net Zero	adnetzero.com
GMSF Documentation	wfanet.org/gmsf
Scope3	scope3.com
IAB Sustainability	iab.com/sustainability

Key Terms

Term	Definition
Carbon offset	Compensating emissions by funding carbon removal
Carbon neutral	Net zero emissions (offsets allowed)
Net zero	Actual zero emissions (no offsets)
Science-based targets	Reduction goals aligned with climate science
GHG Protocol	Standard for measuring greenhouse gases
MFA	Made-for-advertising (low-quality sites)
SPO	Supply path optimization

This is a placeholder document. Content will be enhanced with more detail and citations in future updates.

​GMSF Reference

​What is GMSF?

​Key Organizations

​Carbon Emission Sources in Ad Tech

​By Supply Chain Stage

​Programmatic Waste Points

​GMSF Measurement Framework

​Scope Categories

​Key Metrics

​Typical Carbon Values

​How AdCP Reduces Carbon

​Quantified Benefits

​Sustainability Best Practices

​For Buyers

​For Publishers

​GMSF Resources

​Key Terms