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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
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.01g CO2 per view
FIX
1.01g CO2 per view
Warning::
1.01g CO2 per page view
This page transfers 3.6 MB, producing an estimated 1.01g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.19g, network 0.18g, end-user device 0.65g.
Got: 1.01g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 121.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 121.6 kg of CO2 annually — equivalent to charging 15196 smartphones.

1.01g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 39% of websites

Sustainable Web Design model v4 · Page size: 3.6 MB

Your site
1.01g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.19g
Network
0.18g
End-user device
0.65g
At 10,000 monthly views: Monthly: 10.1 kg · Annual: 121.6 kg · ≈ 15196 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 Tengine✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
61th percentile
FIX
61th percentile
Warning::
1.01g 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

1.01g

61st percentile

Cleaner than 39% of websites

✗ Above the median website

vs Median 69% more
vs Target 103% 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 54 KB (vs 3663 KB first visit). 188 of 191 resources are served from browser cache, saving 1.00g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.01g)
First visit
3663 KB
Repeat visit
54 KB

99% reduction on repeat visits

Saving 1.00g CO2 per returning visitor

188 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 330 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 330 KB (9% of page weight)

Unused JS 330 KB

0.09g unnecessary CO2 per visit

Actual transfer 3663 KB
Theoretical minimum 3332 KB
Potential savings 330 KB (0.09g 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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