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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
61
GRADE
D
FIX
3
REVIEW
1
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
5.09g CO2 per view
FIX
5.09g CO2 per view
Critical::
5.09g CO2 per page view
This page transfers 18.0 MB, producing an estimated 5.09g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.94g, network 0.88g, end-user device 3.27g.
Got: 5.09g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 610.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 610.4 kg of CO2 annually — equivalent to charging 76295 smartphones.

5.09g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 18.0 MB

Your site
5.09g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.94g
Network
0.88g
End-user device
3.27g
At 10,000 monthly views: Monthly: 50.9 kg · Annual: 610.4 kg · ≈ 76295 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 Microsoft IIS✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
5.09g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

5.09g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 748% more
vs Target 917% 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 98 KB (vs 18391 KB first visit). 90 of 91 resources are served from browser cache, saving 5.06g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 5.09g)
First visit
18391 KB
Repeat visit
98 KB

99% reduction on repeat visits

Saving 5.06g CO2 per returning visitor

90 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 367 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 367 KB (2% of page weight)

Unused JS 367 KB

0.10g unnecessary CO2 per visit

Actual transfer 18391 KB
Theoretical minimum 18023 KB
Potential savings 367 KB (0.10g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Web Font Weight Variants
1 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
1 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
1 font weight(s) loaded across 1 famil(y/ies)
Image Optimization
78 images, 15471 KB total, 9823 KB wasted
INFO

Image Optimization Audit

Total Images

78

Total Size

15471 KB

Oversized

55

Wasted

9823 KB

60 missing alt text 62 missing lazy loading
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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