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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
54
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
1.69g CO2 per view
FIX
1.69g CO2 per view
Warning::
1.69g CO2 per page view
This page transfers 6.0 MB, producing an estimated 1.69g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.31g, network 0.29g, end-user device 1.08g.
Got: 1.69g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 202.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 202.5 kg of CO2 annually — equivalent to charging 25312 smartphones.

1.69g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 19% of websites

Sustainable Web Design model v4 · Page size: 6.0 MB

Your site
1.69g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.31g
Network
0.29g
End-user device
1.08g
At 10,000 monthly views: Monthly: 16.9 kg · Annual: 202.5 kg · ≈ 25312 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::
Akamai: Committed to 50% renewable by 2030
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 Not identified✗CDN Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
81th percentile
FIX
81th percentile
Warning::
1.69g CO2 — above the median website (0.60g)
Heavier than an estimated 19% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 81th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.69g

81st percentile

Cleaner than 19% of websites

✗ Above the median website

vs Median 181% more
vs Target 238% more
B
Transfer Efficiency
77% efficient
REVIEW
77% efficient
Info::
Transfer efficiency: 77%
An estimated 1415 KB (23%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1415 KB of unused JavaScript. This wasted data produces 0.39g of unnecessary CO2 per page view.
77% efficient

Total waste: 1415 KB (23% of page weight)

Unused JS 1415 KB

0.39g unnecessary CO2 per visit

Actual transfer 6101 KB
Theoretical minimum 4686 KB
Potential savings 1415 KB (0.39g 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 122 KB (vs 6101 KB first visit). 295 of 300 resources are served from browser cache, saving 1.65g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.69g)
First visit
6101 KB
Repeat visit
122 KB

98% reduction on repeat visits

Saving 1.65g CO2 per returning visitor

295 resources served from cache · 5 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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