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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
64
GRADE
D
FIX
2
REVIEW
3
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 3 REVIEW 2 FIX
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::
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 Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
54th percentile
FIX
54th percentile
Warning::
0.75g CO2 — above the median website (0.60g)
Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 54th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.75g

54th percentile

Cleaner than 46% of websites

✗ Above the median website

vs Median 26% more
vs Target 51% more
B
CO2 Per Page Load
0.75g CO2 per view
REVIEW
0.75g CO2 per view
Info::
0.75g CO2 per page view
This page transfers 2.7 MB, producing an estimated 0.75g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 0.13g, end-user device 0.48g.
Got: 0.75g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 90.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 90.4 kg of CO2 annually — equivalent to charging 11303 smartphones.

0.75g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 46% of websites

Sustainable Web Design model v4 · Page size: 2.7 MB

Your site
0.75g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.14g
Network
0.13g
End-user device
0.48g
At 10,000 monthly views: Monthly: 7.5 kg · Annual: 90.4 kg · ≈ 11303 smartphone charges
C
Transfer Efficiency
Action
68% efficient
REVIEW
68% efficient
Warning::
Transfer efficiency: 68%
An estimated 877 KB (32%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 877 KB of unused JavaScript. This wasted data produces 0.24g of unnecessary CO2 per page view.
68% efficient

Total waste: 877 KB (32% of page weight)

Unused JS 877 KB

0.24g unnecessary CO2 per visit

Actual transfer 2724 KB
Theoretical minimum 1847 KB
Potential savings 877 KB (0.24g 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 48 KB (vs 2724 KB first visit). 44 of 47 resources are served from browser cache, saving 0.74g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.75g)
First visit
2724 KB
Repeat visit
48 KB

98% reduction on repeat visits

Saving 0.74g CO2 per returning visitor

44 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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