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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
2.79g CO2 per view
FIX
2.79g CO2 per view
Critical::
2.79g CO2 per page view
This page transfers 11.8 MB, producing an estimated 2.79g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.58g, end-user device 2.15g.
Got: 2.79g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 335.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 335.1 kg of CO2 annually — equivalent to charging 41891 smartphones.
Info::
Green hosting reduces data center emissions

2.79g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 11.8 MB

Your site
2.79g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.07g
Network
0.58g
End-user device
2.15g
At 10,000 monthly views: Monthly: 27.9 kg · Annual: 335.1 kg · ≈ 41891 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.79g 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

2.79g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 365% more
vs Target 459% more
D
Transfer Efficiency
Action
41% efficient
FIX
41% efficient
Critical::
Transfer efficiency: 41%
An estimated 7080 KB (59%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 7080 KB of unused JavaScript. This wasted data produces 1.64g of unnecessary CO2 per page view.
41% efficient

Total waste: 7080 KB (59% of page weight)

Unused JS 7080 KB

1.64g unnecessary CO2 per visit

Actual transfer 12082 KB
Theoretical minimum 5001 KB
Potential savings 7080 KB (1.64g 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 43 KB (vs 12082 KB first visit). 58 of 59 resources are served from browser cache, saving 2.78g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.79g)
First visit
12082 KB
Repeat visit
43 KB

100% reduction on repeat visits

Saving 2.78g CO2 per returning visitor

58 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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