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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
1.45g CO2 per view
FIX
1.45g CO2 per view
Warning::
1.45g CO2 per page view
This page transfers 5.1 MB, producing an estimated 1.45g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.25g, end-user device 0.93g.
Got: 1.45g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 173.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 173.7 kg of CO2 annually — equivalent to charging 21717 smartphones.

1.45g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 26% of websites

Sustainable Web Design model v4 · Page size: 5.1 MB

Your site
1.45g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
0.25g
End-user device
0.93g
At 10,000 monthly views: Monthly: 14.5 kg · Annual: 173.7 kg · ≈ 21717 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
74th percentile
FIX
74th percentile
Warning::
1.45g CO2 — above the median website (0.60g)
Heavier than an estimated 26% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 74th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.45g

74th percentile

Cleaner than 26% of websites

✗ Above the median website

vs Median 141% more
vs Target 190% more
B
Transfer Efficiency
76% efficient
REVIEW
76% efficient
Info::
Transfer efficiency: 76%
An estimated 1268 KB (24%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1268 KB of unused JavaScript. This wasted data produces 0.35g of unnecessary CO2 per page view.
76% efficient

Total waste: 1268 KB (24% of page weight)

Unused JS 1268 KB

0.35g unnecessary CO2 per visit

Actual transfer 5235 KB
Theoretical minimum 3966 KB
Potential savings 1268 KB (0.35g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 140 KB (vs 5235 KB first visit). 332 of 342 resources are served from browser cache, saving 1.41g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.45g)
First visit
5235 KB
Repeat visit
140 KB

97% reduction on repeat visits

Saving 1.41g CO2 per returning visitor

332 resources served from cache · 10 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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