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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
72
GRADE
C
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
1.11g CO2 per view
FIX
1.11g CO2 per view
Warning::
1.11g CO2 per page view
This page transfers 3.9 MB, producing an estimated 1.11g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.21g, network 0.19g, end-user device 0.71g.
Got: 1.11g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 133.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 133.4 kg of CO2 annually — equivalent to charging 16669 smartphones.

1.11g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 36% of websites

Sustainable Web Design model v4 · Page size: 3.9 MB

Your site
1.11g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.21g
Network
0.19g
End-user device
0.71g
At 10,000 monthly views: Monthly: 11.1 kg · Annual: 133.4 kg · ≈ 16669 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

D
Carbon Budget
Action
64th percentile
FIX
64th percentile
Warning::
1.11g CO2 — above the median website (0.60g)
Heavier than an estimated 36% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 64th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.11g

64th percentile

Cleaner than 36% of websites

✗ Above the median website

vs Median 85% more
vs Target 122% 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
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 147 KB (vs 4018 KB first visit). 101 of 104 resources are served from browser cache, saving 1.07g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.11g)
First visit
4018 KB
Repeat visit
147 KB

96% reduction on repeat visits

Saving 1.07g CO2 per returning visitor

101 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 252 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 252 KB (6% of page weight)

Unused JS 252 KB

0.07g unnecessary CO2 per visit

Actual transfer 4018 KB
Theoretical minimum 3765 KB
Potential savings 252 KB (0.07g 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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