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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
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.35g CO2 per view
FIX
1.35g CO2 per view
Warning::
1.35g CO2 per page view
This page transfers 4.8 MB, producing an estimated 1.35g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.25g, network 0.23g, end-user device 0.87g.
Got: 1.35g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 162.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 162.0 kg of CO2 annually — equivalent to charging 20255 smartphones.

1.35g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 29% of websites

Sustainable Web Design model v4 · Page size: 4.8 MB

Your site
1.35g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.25g
Network
0.23g
End-user device
0.87g
At 10,000 monthly views: Monthly: 13.5 kg · Annual: 162.0 kg · ≈ 20255 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::
Azure: Microsoft is carbon-negative; Azure renewable varies by region
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 Azure✗CDN Not identified✗

Azure: Microsoft is carbon-negative; Azure renewable varies by region

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
71th percentile
FIX
71th percentile
Warning::
1.35g CO2 — above the median website (0.60g)
Heavier than an estimated 29% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 71th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.35g

71st percentile

Cleaner than 29% of websites

✗ Above the median website

vs Median 125% more
vs Target 170% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 514 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 514 KB of unused JavaScript. This wasted data produces 0.14g of unnecessary CO2 per page view.
89% efficient

Total waste: 514 KB (11% of page weight)

Unused JS 514 KB

0.14g unnecessary CO2 per visit

Actual transfer 4882 KB
Theoretical minimum 4367 KB
Potential savings 514 KB (0.14g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 105 KB (vs 4882 KB first visit). 126 of 134 resources are served from browser cache, saving 1.32g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.35g)
First visit
4882 KB
Repeat visit
105 KB

98% reduction on repeat visits

Saving 1.32g CO2 per returning visitor

126 resources served from cache · 8 resources re-downloaded

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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