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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
53
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
3.00g CO2 per view
FIX
3.00g CO2 per view
Critical::
3.00g CO2 per page view
This page transfers 10.6 MB, producing an estimated 3.00g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.56g, network 0.52g, end-user device 1.92g.
Got: 3.00g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 359.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 359.7 kg of CO2 annually — equivalent to charging 44960 smartphones.

3.00g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.6 MB

Your site
3.00g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.56g
Network
0.52g
End-user device
1.92g
At 10,000 monthly views: Monthly: 30.0 kg · Annual: 359.7 kg · ≈ 44960 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::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.00g 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

3.00g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 400% more
vs Target 499% more
B
Transfer Efficiency
78% efficient
REVIEW
78% efficient
Info::
Transfer efficiency: 78%
An estimated 2409 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2409 KB of unused JavaScript. This wasted data produces 0.67g of unnecessary CO2 per page view.
78% efficient

Total waste: 2409 KB (22% of page weight)

Unused JS 2409 KB

0.67g unnecessary CO2 per visit

Actual transfer 10838 KB
Theoretical minimum 8428 KB
Potential savings 2409 KB (0.67g 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 247 KB (vs 10838 KB first visit). 88 of 91 resources are served from browser cache, saving 2.93g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 3.00g)
First visit
10838 KB
Repeat visit
247 KB

98% reduction on repeat visits

Saving 2.93g CO2 per returning visitor

88 resources served from cache · 3 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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