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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
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.73g CO2 per view
FIX
1.73g CO2 per view
Warning::
1.73g CO2 per page view
This page transfers 6.1 MB, producing an estimated 1.73g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.32g, network 0.30g, end-user device 1.11g.
Got: 1.73g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 207.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 207.8 kg of CO2 annually — equivalent to charging 25974 smartphones.

1.73g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 18% of websites

Sustainable Web Design model v4 · Page size: 6.1 MB

Your site
1.73g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.32g
Network
0.30g
End-user device
1.11g
At 10,000 monthly views: Monthly: 17.3 kg · Annual: 207.8 kg · ≈ 25974 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 Next.js✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
82th percentile
FIX
82th percentile
Warning::
1.73g CO2 — above the median website (0.60g)
Heavier than an estimated 18% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 82th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.73g

82nd percentile

Cleaner than 18% of websites

✗ Above the median website

vs Median 189% more
vs Target 246% more
B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 1073 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1073 KB of unused JavaScript. This wasted data produces 0.30g of unnecessary CO2 per page view.
83% efficient

Total waste: 1073 KB (17% of page weight)

Unused JS 1073 KB

0.30g unnecessary CO2 per visit

Actual transfer 6261 KB
Theoretical minimum 5188 KB
Potential savings 1073 KB (0.30g 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 68 KB (vs 6261 KB first visit). 223 of 227 resources are served from browser cache, saving 1.71g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.73g)
First visit
6261 KB
Repeat visit
68 KB

99% reduction on repeat visits

Saving 1.71g CO2 per returning visitor

223 resources served from cache · 4 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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