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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
0.85g CO2 per view
FIX
0.85g CO2 per view
Info::
0.85g CO2 per page view
This page transfers 3.0 MB, producing an estimated 0.85g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.16g, network 0.15g, end-user device 0.55g.
Got: 0.85g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 102.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 102.5 kg of CO2 annually — equivalent to charging 12812 smartphones.

0.85g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 43% of websites

Sustainable Web Design model v4 · Page size: 3.0 MB

Your site
0.85g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.16g
Network
0.15g
End-user device
0.55g
At 10,000 monthly views: Monthly: 8.5 kg · Annual: 102.5 kg · ≈ 12812 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

D
Carbon Budget
Action
57th percentile
FIX
57th percentile
Warning::
0.85g CO2 — above the median website (0.60g)
Heavier than an estimated 43% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 57th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.85g

57th percentile

Cleaner than 43% of websites

✗ Above the median website

vs Median 42% more
vs Target 71% more
C
Transfer Efficiency
Action
64% efficient
REVIEW
64% efficient
Warning::
Transfer efficiency: 64%
An estimated 1115 KB (36%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1115 KB of unused JavaScript. This wasted data produces 0.31g of unnecessary CO2 per page view.
64% efficient

Total waste: 1115 KB (36% of page weight)

Unused JS 1115 KB

0.31g unnecessary CO2 per visit

Actual transfer 3088 KB
Theoretical minimum 1973 KB
Potential savings 1115 KB (0.31g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 79 KB (vs 3088 KB first visit). 104 of 105 resources are served from browser cache, saving 0.83g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.85g)
First visit
3088 KB
Repeat visit
79 KB

97% reduction on repeat visits

Saving 0.83g CO2 per returning visitor

104 resources served from cache · 1 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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