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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
69
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.89g CO2 per view
FIX
1.89g CO2 per view
Warning::
1.89g CO2 per page view
This page transfers 8.0 MB, producing an estimated 1.89g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.39g, end-user device 1.45g.
Got: 1.89g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 226.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 226.9 kg of CO2 annually — equivalent to charging 28365 smartphones.
Info::
Green hosting reduces data center emissions

1.89g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 14% of websites

Sustainable Web Design model v4 · Page size: 8.0 MB

Your site
1.89g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.39g
End-user device
1.45g
At 10,000 monthly views: Monthly: 18.9 kg · Annual: 226.9 kg · ≈ 28365 smartphone charges
F
Carbon Budget
Action
86th percentile
FIX
86th percentile
Warning::
1.89g CO2 — above the median website (0.60g)
Heavier than an estimated 14% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 86th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.89g

86th percentile

Cleaner than 14% of websites

✗ Above the median website

vs Median 215% more
vs Target 278% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Fastly CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Fastly: 100% renewable energy for edge network
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green Hosting✓ Green Hosted
Hosting Not identified✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 291 KB (vs 8181 KB first visit). 216 of 221 resources are served from browser cache, saving 1.82g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 1.89g)
First visit
8181 KB
Repeat visit
291 KB

96% reduction on repeat visits

Saving 1.82g CO2 per returning visitor

216 resources served from cache · 5 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 8181 KB
Theoretical minimum 8181 KB

See Deep Analysis sections above for specific optimizations.

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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