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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
68
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::
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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
CO2 Per Page Load
0.56g CO2 per view
REVIEW
0.56g CO2 per view
Info::
0.56g CO2 per page view
This page transfers 2.0 MB, producing an estimated 0.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.10g, end-user device 0.36g.
Got: 0.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 67.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 67.3 kg of CO2 annually — equivalent to charging 8416 smartphones.

0.56g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 54% of websites

Sustainable Web Design model v4 · Page size: 2.0 MB

Your site
0.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.10g
Network
0.10g
End-user device
0.36g
At 10,000 monthly views: Monthly: 5.6 kg · Annual: 67.3 kg · ≈ 8416 smartphone charges
B
Carbon Budget
46th percentile
REVIEW
46th percentile
Info::
0.56g CO2 — below the median website (0.60g)
Better than an estimated 54% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 46th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.56g

46th percentile

Cleaner than 54% of websites

✗ Above the median website

vs Median 6% cleaner ✓
vs Target 12% more
C
Transfer Efficiency
Action
72% efficient
REVIEW
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 571 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 571 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.
72% efficient

Total waste: 571 KB (28% of page weight)

Unused JS 571 KB

0.16g unnecessary CO2 per visit

Actual transfer 2028 KB
Theoretical minimum 1457 KB
Potential savings 571 KB (0.16g 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 33 KB (vs 2028 KB first visit). 68 of 71 resources are served from browser cache, saving 0.55g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.56g)
First visit
2028 KB
Repeat visit
33 KB

98% reduction on repeat visits

Saving 0.55g CO2 per returning visitor

68 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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