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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
54
GRADE
F
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
3.56g CO2 per view
FIX
3.56g CO2 per view
Critical::
3.56g CO2 per page view
This page transfers 12.6 MB, producing an estimated 3.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.66g, network 0.62g, end-user device 2.29g.
Got: 3.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 427.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 427.6 kg of CO2 annually — equivalent to charging 53450 smartphones.

3.56g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 12.6 MB

Your site
3.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.66g
Network
0.62g
End-user device
2.29g
At 10,000 monthly views: Monthly: 35.6 kg · Annual: 427.6 kg · ≈ 53450 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::
3.56g 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

3.56g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 494% more
vs Target 613% 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 72 KB (vs 12884 KB first visit). 242 of 245 resources are served from browser cache, saving 3.54g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 3.56g)
First visit
12884 KB
Repeat visit
72 KB

99% reduction on repeat visits

Saving 3.54g CO2 per returning visitor

242 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 1083 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 1083 KB (8% of page weight)

Unused JS 1083 KB

0.30g unnecessary CO2 per visit

Actual transfer 12884 KB
Theoretical minimum 11801 KB
Potential savings 1083 KB (0.30g 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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