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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
0.81g CO2 per view
FIX
0.81g CO2 per view
Info::
0.81g CO2 per page view
This page transfers 3.4 MB, producing an estimated 0.81g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.17g, end-user device 0.62g.
Got: 0.81g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 97.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 97.1 kg of CO2 annually — equivalent to charging 12141 smartphones.
Info::
Green hosting reduces data center emissions

0.81g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 45% of websites

Sustainable Web Design model v4 · Page size: 3.4 MB

Your site
0.81g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.17g
End-user device
0.62g
At 10,000 monthly views: Monthly: 8.1 kg · Annual: 97.1 kg · ≈ 12141 smartphone charges
D
Carbon Budget
Action
55th percentile
FIX
55th percentile
Warning::
0.81g CO2 — above the median website (0.60g)
Heavier than an estimated 45% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 55th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.81g

55th percentile

Cleaner than 45% of websites

✗ Above the median website

vs Median 35% more
vs Target 62% more
B
Transfer Efficiency
79% efficient
REVIEW
79% efficient
Info::
Transfer efficiency: 79%
An estimated 729 KB (21%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 729 KB of unused JavaScript. This wasted data produces 0.17g of unnecessary CO2 per page view.
79% efficient

Total waste: 729 KB (21% of page weight)

Unused JS 729 KB

0.17g unnecessary CO2 per visit

Actual transfer 3501 KB
Theoretical minimum 2772 KB
Potential savings 729 KB (0.17g 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 78 KB (vs 3501 KB first visit). 98 of 99 resources are served from browser cache, saving 0.79g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.81g)
First visit
3501 KB
Repeat visit
78 KB

98% reduction on repeat visits

Saving 0.79g CO2 per returning visitor

98 resources served from cache · 1 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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