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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
57
GRADE
D
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
2.80g CO2 per view
FIX
2.80g CO2 per view
Critical::
2.80g CO2 per page view
This page transfers 9.9 MB, producing an estimated 2.80g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.52g, network 0.48g, end-user device 1.80g.
Got: 2.80g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 336.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 336.3 kg of CO2 annually — equivalent to charging 42040 smartphones.

2.80g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 9.9 MB

Your site
2.80g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.52g
Network
0.48g
End-user device
1.80g
At 10,000 monthly views: Monthly: 28.0 kg · Annual: 336.3 kg · ≈ 42040 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::
2.80g 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

2.80g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 367% more
vs Target 461% 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 74 KB (vs 10134 KB first visit). 169 of 170 resources are served from browser cache, saving 2.78g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.80g)
First visit
10134 KB
Repeat visit
74 KB

99% reduction on repeat visits

Saving 2.78g CO2 per returning visitor

169 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 463 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 463 KB (5% of page weight)

Unused JS 463 KB

0.13g unnecessary CO2 per visit

Actual transfer 10134 KB
Theoretical minimum 9670 KB
Potential savings 463 KB (0.13g 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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