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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
69
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
1.64g CO2 per view
FIX
1.64g CO2 per view
Warning::
1.64g CO2 per page view
This page transfers 6.9 MB, producing an estimated 1.64g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.34g, end-user device 1.26g.
Got: 1.64g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 196.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 196.7 kg of CO2 annually — equivalent to charging 24592 smartphones.
Info::
Green hosting reduces data center emissions

1.64g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 21% of websites

Sustainable Web Design model v4 · Page size: 6.9 MB

Your site
1.64g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.34g
End-user device
1.26g
At 10,000 monthly views: Monthly: 16.4 kg · Annual: 196.7 kg · ≈ 24592 smartphone charges
F
Carbon Budget
Action
79th percentile
FIX
79th percentile
Warning::
1.64g CO2 — above the median website (0.60g)
Heavier than an estimated 21% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 79th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.64g

79th percentile

Cleaner than 21% of websites

✗ Above the median website

vs Median 173% more
vs Target 228% more
B
Transfer Efficiency
85% efficient
REVIEW
85% efficient
Info::
Transfer efficiency: 85%
An estimated 1061 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1061 KB of unused JavaScript. This wasted data produces 0.25g of unnecessary CO2 per page view.
85% efficient

Total waste: 1061 KB (15% of page weight)

Unused JS 1061 KB

0.25g unnecessary CO2 per visit

Actual transfer 7093 KB
Theoretical minimum 6031 KB
Potential savings 1061 KB (0.25g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 197 KB (vs 7093 KB first visit). 284 of 286 resources are served from browser cache, saving 1.59g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 1.64g)
First visit
7093 KB
Repeat visit
197 KB

97% reduction on repeat visits

Saving 1.59g CO2 per returning visitor

284 resources served from cache · 2 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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