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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
53
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.96g CO2 per view
FIX
1.96g CO2 per view
Warning::
1.96g CO2 per page view
This page transfers 6.9 MB, producing an estimated 1.96g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.36g, network 0.34g, end-user device 1.26g.
Got: 1.96g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 235.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 235.4 kg of CO2 annually — equivalent to charging 29426 smartphones.

1.96g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 12% of websites

Sustainable Web Design model v4 · Page size: 6.9 MB

Your site
1.96g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.36g
Network
0.34g
End-user device
1.26g
At 10,000 monthly views: Monthly: 19.6 kg · Annual: 235.4 kg · ≈ 29426 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

F
Carbon Budget
Action
88th percentile
FIX
88th percentile
Warning::
1.96g CO2 — above the median website (0.60g)
Heavier than an estimated 12% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 88th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.96g

88th percentile

Cleaner than 12% of websites

✗ Above the median website

vs Median 227% more
vs Target 292% more
B
Transfer Efficiency
81% efficient
REVIEW
81% efficient
Info::
Transfer efficiency: 81%
An estimated 1337 KB (19%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1337 KB of unused JavaScript. This wasted data produces 0.37g of unnecessary CO2 per page view.
81% efficient

Total waste: 1337 KB (19% of page weight)

Unused JS 1337 KB

0.37g unnecessary CO2 per visit

Actual transfer 7093 KB
Theoretical minimum 5755 KB
Potential savings 1337 KB (0.37g 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
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 431 KB (vs 7093 KB first visit). 494 of 517 resources are served from browser cache, saving 1.84g CO2 per repeat visit.
Info::
Repeat visit: 0.12g CO2 (first visit: 1.96g)
First visit
7093 KB
Repeat visit
431 KB

94% reduction on repeat visits

Saving 1.84g CO2 per returning visitor

494 resources served from cache · 23 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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