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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
76
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.02g CO2 per view
FIX
1.02g CO2 per view
Warning::
1.02g CO2 per page view
This page transfers 4.3 MB, producing an estimated 1.02g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.21g, end-user device 0.79g.
Got: 1.02g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 122.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 122.7 kg of CO2 annually — equivalent to charging 15343 smartphones.
Info::
Green hosting reduces data center emissions

1.02g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 38% of websites

Sustainable Web Design model v4 · Page size: 4.3 MB

Your site
1.02g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.21g
End-user device
0.79g
At 10,000 monthly views: Monthly: 10.2 kg · Annual: 122.7 kg · ≈ 15343 smartphone charges
D
Carbon Budget
Action
62th percentile
FIX
62th percentile
Warning::
1.02g CO2 — above the median website (0.60g)
Heavier than an estimated 38% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 62th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.02g

62nd percentile

Cleaner than 38% of websites

✗ Above the median website

vs Median 70% more
vs Target 105% more
B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 739 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 739 KB of unused JavaScript. This wasted data produces 0.17g of unnecessary CO2 per page view.
83% efficient

Total waste: 739 KB (17% of page weight)

Unused JS 739 KB

0.17g unnecessary CO2 per visit

Actual transfer 4425 KB
Theoretical minimum 3685 KB
Potential savings 739 KB (0.17g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Fastly
Info::
Next.js: Verified by the Green Web Foundation
Info::
Fastly: 100% renewable energy for edge network
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 Fastly✓

Next.js: Verified by the Green Web Foundation

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
87% cached
PASS
87% cached
Info::
87% reduction on repeat visits
Returning visitors download only 595 KB (vs 4425 KB first visit). 174 of 177 resources are served from browser cache, saving 0.89g CO2 per repeat visit.
Info::
Repeat visit: 0.14g CO2 (first visit: 1.02g)
First visit
4425 KB
Repeat visit
595 KB

87% reduction on repeat visits

Saving 0.89g CO2 per returning visitor

174 resources served from cache · 3 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: Axis12 Ltd

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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