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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
1.03g CO2 per view
FIX
1.03g CO2 per view
Warning::
1.03g CO2 per page view
This page transfers 3.6 MB, producing an estimated 1.03g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.19g, network 0.18g, end-user device 0.66g.
Got: 1.03g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 123.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 123.7 kg of CO2 annually — equivalent to charging 15462 smartphones.

1.03g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 38% of websites

Sustainable Web Design model v4 · Page size: 3.6 MB

Your site
1.03g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.19g
Network
0.18g
End-user device
0.66g
At 10,000 monthly views: Monthly: 10.3 kg · Annual: 123.7 kg · ≈ 15462 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::
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
62th percentile
FIX
62th percentile
Warning::
1.03g CO2 — above the median website (0.60g)
Heavier than an estimated 38% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 62th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.03g

62nd percentile

Cleaner than 38% of websites

✗ Above the median website

vs Median 72% more
vs Target 106% more
C
Transfer Efficiency
Action
67% efficient
REVIEW
67% efficient
Warning::
Transfer efficiency: 67%
An estimated 1237 KB (33%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1237 KB of unused JavaScript. This wasted data produces 0.34g of unnecessary CO2 per page view.
67% efficient

Total waste: 1237 KB (33% of page weight)

Unused JS 1237 KB

0.34g unnecessary CO2 per visit

Actual transfer 3727 KB
Theoretical minimum 2489 KB
Potential savings 1237 KB (0.34g 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
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 202 KB (vs 3727 KB first visit). 217 of 230 resources are served from browser cache, saving 0.97g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.03g)
First visit
3727 KB
Repeat visit
202 KB

95% reduction on repeat visits

Saving 0.97g CO2 per returning visitor

217 resources served from cache · 13 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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