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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
56
GRADE
D
FIX
4
REVIEW
1
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 1 REVIEW 4 FIX
D
CO2 Per Page Load
Action
1.00g CO2 per view
FIX
1.00g CO2 per view
Warning::
1.00g CO2 per page view
This page transfers 3.5 MB, producing an estimated 1.00g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.19g, network 0.17g, end-user device 0.64g.
Got: 1.00g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 120.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 120.3 kg of CO2 annually — equivalent to charging 15040 smartphones.

1.00g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 39% of websites

Sustainable Web Design model v4 · Page size: 3.5 MB

Your site
1.00g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.19g
Network
0.17g
End-user device
0.64g
At 10,000 monthly views: Monthly: 10.0 kg · Annual: 120.3 kg · ≈ 15040 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::
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 Akamai Connected Cloud✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
61th percentile
FIX
61th percentile
Warning::
1.00g CO2 — above the median website (0.60g)
Heavier than an estimated 39% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 61th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.00g

61st percentile

Cleaner than 39% of websites

✗ Above the median website

vs Median 67% more
vs Target 101% more
D
Transfer Efficiency
Action
47% efficient
FIX
47% efficient
Critical::
Transfer efficiency: 47%
An estimated 1903 KB (53%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1903 KB of unused JavaScript. This wasted data produces 0.53g of unnecessary CO2 per page view.
47% efficient

Total waste: 1903 KB (53% of page weight)

Unused JS 1903 KB

0.53g unnecessary CO2 per visit

Actual transfer 3625 KB
Theoretical minimum 1721 KB
Potential savings 1903 KB (0.53g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 104 KB (vs 3625 KB first visit). 182 of 188 resources are served from browser cache, saving 0.97g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.00g)
First visit
3625 KB
Repeat visit
104 KB

97% reduction on repeat visits

Saving 0.97g CO2 per returning visitor

182 resources served from cache · 6 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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