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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
1.94g CO2 per view
FIX
1.94g CO2 per view
Warning::
1.94g CO2 per page view
This page transfers 6.9 MB, producing an estimated 1.94g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.36g, network 0.34g, end-user device 1.25g.
Got: 1.94g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 232.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 232.8 kg of CO2 annually — equivalent to charging 29099 smartphones.

1.94g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 12% of websites

Sustainable Web Design model v4 · Page size: 6.9 MB

Your site
1.94g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.36g
Network
0.34g
End-user device
1.25g
At 10,000 monthly views: Monthly: 19.4 kg · Annual: 232.8 kg · ≈ 29099 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
88th percentile
FIX
88th percentile
Warning::
1.94g CO2 — above the median website (0.60g)
Heavier than an estimated 12% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 88th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.94g

88th percentile

Cleaner than 12% of websites

✗ Above the median website

vs Median 223% more
vs Target 288% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 24 KB (vs 7014 KB first visit). 121 of 123 resources are served from browser cache, saving 1.93g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.94g)
First visit
7014 KB
Repeat visit
24 KB

100% reduction on repeat visits

Saving 1.93g CO2 per returning visitor

121 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 532 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 532 KB (8% of page weight)

Unused JS 532 KB

0.15g unnecessary CO2 per visit

Actual transfer 7014 KB
Theoretical minimum 6481 KB
Potential savings 532 KB (0.15g 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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