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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
60
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.70g CO2 per view
FIX
1.70g CO2 per view
Warning::
1.70g CO2 per page view
This page transfers 6.0 MB, producing an estimated 1.70g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.31g, network 0.29g, end-user device 1.09g.
Got: 1.70g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 204.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 204.1 kg of CO2 annually — equivalent to charging 25509 smartphones.

1.70g

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
1.70g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.31g
Network
0.29g
End-user device
1.09g
At 10,000 monthly views: Monthly: 17.0 kg · Annual: 204.1 kg · ≈ 25509 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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
81th percentile
FIX
81th percentile
Warning::
1.70g 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

1.70g

81st percentile

Cleaner than 19% of websites

✗ Above the median website

vs Median 183% more
vs Target 240% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 352 KB (vs 6149 KB first visit). 263 of 268 resources are served from browser cache, saving 1.60g CO2 per repeat visit.
Info::
Repeat visit: 0.10g CO2 (first visit: 1.70g)
First visit
6149 KB
Repeat visit
352 KB

94% reduction on repeat visits

Saving 1.60g CO2 per returning visitor

263 resources served from cache · 5 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 468 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 468 KB (8% of page weight)

Unused JS 468 KB

0.13g unnecessary CO2 per visit

Actual transfer 6149 KB
Theoretical minimum 5680 KB
Potential savings 468 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

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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