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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
64
GRADE
D
FIX
1
REVIEW
4
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 4 REVIEW 1 FIX
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: Renewable energy varies by region; committed to 100% by 2025
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 AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
CO2 Per Page Load
0.50g CO2 per view
REVIEW
0.50g CO2 per view
Info::
0.50g CO2 per page view
This page transfers 1.8 MB, producing an estimated 0.50g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.09g, end-user device 0.32g.
Got: 0.50g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 60.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 60.4 kg of CO2 annually — equivalent to charging 7555 smartphones.

0.50g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 60% of websites

Sustainable Web Design model v4 · Page size: 1.8 MB

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

Energy Breakdown

Data center
0.09g
Network
0.09g
End-user device
0.32g
At 10,000 monthly views: Monthly: 5.0 kg · Annual: 60.4 kg · ≈ 7555 smartphone charges
B
Carbon Budget
40th percentile
REVIEW
40th percentile
Info::
0.50g CO2 — below the median website (0.60g)
Better than an estimated 60% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 40th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.50g

40th percentile

Cleaner than 60% of websites

✗ Above the median website

vs Median 16% cleaner ✓
vs Target 1% more
B
Transfer Efficiency
78% efficient
REVIEW
78% efficient
Info::
Transfer efficiency: 78%
An estimated 409 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 409 KB of unused JavaScript. This wasted data produces 0.11g of unnecessary CO2 per page view.
78% efficient

Total waste: 409 KB (22% of page weight)

Unused JS 409 KB

0.11g unnecessary CO2 per visit

Actual transfer 1821 KB
Theoretical minimum 1411 KB
Potential savings 409 KB (0.11g 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
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 83 KB (vs 1821 KB first visit). 157 of 160 resources are served from browser cache, saving 0.48g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.50g)
First visit
1821 KB
Repeat visit
83 KB

95% reduction on repeat visits

Saving 0.48g CO2 per returning visitor

157 resources served from cache · 3 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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