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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
52
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.64g CO2 per view
FIX
1.64g CO2 per view
Warning::
1.64g CO2 per page view
This page transfers 5.8 MB, producing an estimated 1.64g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.30g, network 0.28g, end-user device 1.05g.
Got: 1.64g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 197.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 197.2 kg of CO2 annually — equivalent to charging 24649 smartphones.

1.64g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 21% of websites

Sustainable Web Design model v4 · Page size: 5.8 MB

Your site
1.64g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.30g
Network
0.28g
End-user device
1.05g
At 10,000 monthly views: Monthly: 16.4 kg · Annual: 197.2 kg · ≈ 24649 smartphone charges
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
AWS CloudFront: Renewable varies by edge location
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 HostingNot Green Hosted
Hosting Amazon Web Services✗CDN AWS CloudFront✗

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
79th percentile
FIX
79th percentile
Warning::
1.64g CO2 — above the median website (0.60g)
Heavier than an estimated 21% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 79th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.64g

79th percentile

Cleaner than 21% of websites

✗ Above the median website

vs Median 174% more
vs Target 229% more
C
Transfer Efficiency
Action
75% efficient
REVIEW
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 1492 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1492 KB of unused JavaScript. This wasted data produces 0.41g of unnecessary CO2 per page view.
75% efficient

Total waste: 1492 KB (25% of page weight)

Unused JS 1492 KB

0.41g unnecessary CO2 per visit

Actual transfer 5941 KB
Theoretical minimum 4449 KB
Potential savings 1492 KB (0.41g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 47 KB (vs 5941 KB first visit). 175 of 177 resources are served from browser cache, saving 1.63g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.64g)
First visit
5941 KB
Repeat visit
47 KB

99% reduction on repeat visits

Saving 1.63g CO2 per returning visitor

175 resources served from cache · 2 resources re-downloaded

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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