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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
5.03g CO2 per view
FIX
5.03g CO2 per view
Critical::
5.03g CO2 per page view
This page transfers 17.8 MB, producing an estimated 5.03g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.93g, network 0.87g, end-user device 3.23g.
Got: 5.03g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 603.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 603.3 kg of CO2 annually — equivalent to charging 75409 smartphones.

5.03g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 17.8 MB

Your site
5.03g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.93g
Network
0.87g
End-user device
3.23g
At 10,000 monthly views: Monthly: 50.3 kg · Annual: 603.3 kg · ≈ 75409 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::
5.03g 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

5.03g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 738% more
vs Target 905% 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 125 KB (vs 18177 KB first visit). 379 of 382 resources are served from browser cache, saving 4.99g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 5.03g)
First visit
18177 KB
Repeat visit
125 KB

99% reduction on repeat visits

Saving 4.99g CO2 per returning visitor

379 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 913 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 913 KB (5% of page weight)

Unused JS 913 KB

0.25g unnecessary CO2 per visit

Actual transfer 18177 KB
Theoretical minimum 17263 KB
Potential savings 913 KB (0.25g 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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