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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
53
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
3.09g CO2 per view
FIX
3.09g CO2 per view
Critical::
3.09g CO2 per page view
This page transfers 13.1 MB, producing an estimated 3.09g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.64g, end-user device 2.37g.
Got: 3.09g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 370.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 370.9 kg of CO2 annually — equivalent to charging 46361 smartphones.
Info::
Green hosting reduces data center emissions

3.09g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 13.1 MB

Your site
3.09g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.08g
Network
0.64g
End-user device
2.37g
At 10,000 monthly views: Monthly: 30.9 kg · Annual: 370.9 kg · ≈ 46361 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.09g 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

3.09g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 415% more
vs Target 518% more
D
Transfer Efficiency
Action
48% efficient
FIX
48% efficient
Critical::
Transfer efficiency: 48%
An estimated 7009 KB (52%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 7009 KB of unused JavaScript. This wasted data produces 1.62g of unnecessary CO2 per page view.
48% efficient

Total waste: 7009 KB (52% of page weight)

Unused JS 7009 KB

1.62g unnecessary CO2 per visit

Actual transfer 13371 KB
Theoretical minimum 6362 KB
Potential savings 7009 KB (1.62g CO2)

See Deep Analysis sections above for specific optimizations.

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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 29 KB (vs 13371 KB first visit). 68 of 69 resources are served from browser cache, saving 3.08g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 3.09g)
First visit
13371 KB
Repeat visit
29 KB

100% reduction on repeat visits

Saving 3.08g CO2 per returning visitor

68 resources served from cache · 1 resources re-downloaded

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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