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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
65
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.51g CO2 per view
FIX
2.51g CO2 per view
Critical::
2.51g CO2 per page view
This page transfers 10.6 MB, producing an estimated 2.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.52g, end-user device 1.93g.
Got: 2.51g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 301.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 301.7 kg of CO2 annually — equivalent to charging 37710 smartphones.
Info::
Green hosting reduces data center emissions

2.51g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.6 MB

Your site
2.51g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.06g
Network
0.52g
End-user device
1.93g
At 10,000 monthly views: Monthly: 25.1 kg · Annual: 301.7 kg · ≈ 37710 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.51g 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

2.51g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 319% more
vs Target 403% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Next.js uses renewable energy
Info::
Next.js: Verified by the Green Web Foundation
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 Hosting✓ Green Hosted
Hosting Next.js✓CDN Not identified✗

Next.js: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 168 KB (vs 10876 KB first visit). 156 of 159 resources are served from browser cache, saving 2.48g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 2.51g)
First visit
10876 KB
Repeat visit
168 KB

98% reduction on repeat visits

Saving 2.48g CO2 per returning visitor

156 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 595 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 595 KB (5% of page weight)

Unused JS 595 KB

0.14g unnecessary CO2 per visit

Actual transfer 10876 KB
Theoretical minimum 10281 KB
Potential savings 595 KB (0.14g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

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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