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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
61
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.13g CO2 per view
FIX
2.13g CO2 per view
Critical::
2.13g CO2 per page view
This page transfers 9.0 MB, producing an estimated 2.13g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.44g, end-user device 1.64g.
Got: 2.13g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 256.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 256.1 kg of CO2 annually — equivalent to charging 32013 smartphones.
Info::
Green hosting reduces data center emissions

2.13g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 9.0 MB

Your site
2.13g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.44g
End-user device
1.64g
At 10,000 monthly views: Monthly: 21.3 kg · Annual: 256.1 kg · ≈ 32013 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.13g 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

2.13g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 256% more
vs Target 327% 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

B
Transfer Efficiency
80% efficient
REVIEW
80% efficient
Info::
Transfer efficiency: 80%
An estimated 1814 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1814 KB of unused JavaScript. This wasted data produces 0.42g of unnecessary CO2 per page view.
80% efficient

Total waste: 1814 KB (20% of page weight)

Unused JS 1814 KB

0.42g unnecessary CO2 per visit

Actual transfer 9233 KB
Theoretical minimum 7418 KB
Potential savings 1814 KB (0.42g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 484 KB (vs 9233 KB first visit). 726 of 757 resources are served from browser cache, saving 2.02g CO2 per repeat visit.
Info::
Repeat visit: 0.11g CO2 (first visit: 2.13g)
First visit
9233 KB
Repeat visit
484 KB

95% reduction on repeat visits

Saving 2.02g CO2 per returning visitor

726 resources served from cache · 31 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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