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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
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
8.37g CO2 per view
FIX
8.37g CO2 per view
Critical::
8.37g CO2 per page view
This page transfers 29.6 MB, producing an estimated 8.37g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 1.55g, network 1.45g, end-user device 5.37g.
Got: 8.37g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1004.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1004.6 kg of CO2 annually — equivalent to charging 125580 smartphones.

8.37g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 29.6 MB

Your site
8.37g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
1.55g
Network
1.45g
End-user device
5.37g
At 10,000 monthly views: Monthly: 83.7 kg · Annual: 1004.6 kg · ≈ 125580 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
95th percentile
FIX
95th percentile
Warning::
8.37g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

8.37g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1295% more
vs Target 1574% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 68 KB (vs 30271 KB first visit). 319 of 323 resources are served from browser cache, saving 8.35g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 8.37g)
First visit
30271 KB
Repeat visit
68 KB

100% reduction on repeat visits

Saving 8.35g CO2 per returning visitor

319 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 1748 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 1748 KB (6% of page weight)

Unused JS 1748 KB

0.48g unnecessary CO2 per visit

Actual transfer 30271 KB
Theoretical minimum 28522 KB
Potential savings 1748 KB (0.48g CO2)

See Deep Analysis sections above for specific optimizations.

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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