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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
73
GRADE
C
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.23g CO2 per view
FIX
1.23g CO2 per view
Warning::
1.23g CO2 per page view
This page transfers 5.2 MB, producing an estimated 1.23g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.25g, end-user device 0.94g.
Got: 1.23g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 147.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 147.4 kg of CO2 annually — equivalent to charging 18427 smartphones.
Info::
Green hosting reduces data center emissions

1.23g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 33% of websites

Sustainable Web Design model v4 · Page size: 5.2 MB

Your site
1.23g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.25g
End-user device
0.94g
At 10,000 monthly views: Monthly: 12.3 kg · Annual: 147.4 kg · ≈ 18427 smartphone charges
D
Carbon Budget
Action
67th percentile
FIX
67th percentile
Warning::
1.23g CO2 — above the median website (0.60g)
Heavier than an estimated 33% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 67th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.23g

67th percentile

Cleaner than 33% of websites

✗ Above the median website

vs Median 105% more
vs Target 146% more
B
Transfer Efficiency
84% efficient
REVIEW
84% efficient
Info::
Transfer efficiency: 84%
An estimated 826 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 826 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
84% efficient

Total waste: 826 KB (16% of page weight)

Unused JS 826 KB

0.19g unnecessary CO2 per visit

Actual transfer 5314 KB
Theoretical minimum 4488 KB
Potential savings 826 KB (0.19g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Vercel CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
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 Vercel✓

Vercel: Hosted on AWS/Google Cloud with renewable energy commitments

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 55 KB (vs 5314 KB first visit). 173 of 180 resources are served from browser cache, saving 1.22g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.23g)
First visit
5314 KB
Repeat visit
55 KB

99% reduction on repeat visits

Saving 1.22g CO2 per returning visitor

173 resources served from cache · 7 resources re-downloaded

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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