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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
85
GRADE
B
FIX
0
REVIEW
3
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 3 REVIEW
B
CO2 Per Page Load
0.60g CO2 per view
REVIEW
0.60g CO2 per view
Info::
0.60g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.60g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.46g.
Got: 0.60g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 71.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 71.7 kg of CO2 annually — equivalent to charging 8966 smartphones.
Info::
Green hosting reduces data center emissions

0.60g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 51% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

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

Energy Breakdown

Data center
0.01g
Network
0.12g
End-user device
0.46g
At 10,000 monthly views: Monthly: 6.0 kg · Annual: 71.7 kg · ≈ 8966 smartphone charges
B
Carbon Budget
49th percentile
REVIEW
49th percentile
Info::
0.60g CO2 — below the median website (0.60g)
Better than an estimated 51% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 49th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.60g

49th percentile

Cleaner than 51% of websites

✗ Above the median website

vs Median 0% cleaner ✓
vs Target 20% more
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
90% cached
PASS
90% cached
Info::
90% reduction on repeat visits
Returning visitors download only 251 KB (vs 2586 KB first visit). 86 of 91 resources are served from browser cache, saving 0.54g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 0.60g)
First visit
2586 KB
Repeat visit
251 KB

90% reduction on repeat visits

Saving 0.54g CO2 per returning visitor

86 resources served from cache · 5 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 106 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 106 KB (4% of page weight)

Unused JS 106 KB

0.02g unnecessary CO2 per visit

Actual transfer 2586 KB
Theoretical minimum 2479 KB
Potential savings 106 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

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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