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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
68
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.30g CO2 per view
FIX
1.30g CO2 per view
Warning::
1.30g CO2 per page view
This page transfers 4.6 MB, producing an estimated 1.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.24g, network 0.22g, end-user device 0.83g.
Got: 1.30g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 155.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 155.7 kg of CO2 annually — equivalent to charging 19459 smartphones.

1.30g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 31% of websites

Sustainable Web Design model v4 · Page size: 4.6 MB

Your site
1.30g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.24g
Network
0.22g
End-user device
0.83g
At 10,000 monthly views: Monthly: 13.0 kg · Annual: 155.7 kg · ≈ 19459 smartphone charges
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
Akamai: Committed to 50% renewable by 2030
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 HostingNot Green Hosted
Hosting Not identified✗CDN Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
69th percentile
FIX
69th percentile
Warning::
1.30g CO2 — above the median website (0.60g)
Heavier than an estimated 31% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 69th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.30g

69th percentile

Cleaner than 31% of websites

✗ Above the median website

vs Median 116% more
vs Target 159% more
B
Transfer Efficiency
85% efficient
REVIEW
85% efficient
Info::
Transfer efficiency: 85%
An estimated 684 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 684 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
85% efficient

Total waste: 684 KB (15% of page weight)

Unused JS 684 KB

0.19g unnecessary CO2 per visit

Actual transfer 4690 KB
Theoretical minimum 4005 KB
Potential savings 684 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+
Repeat Visit Weight
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 369 KB (vs 4690 KB first visit). 401 of 439 resources are served from browser cache, saving 1.20g CO2 per repeat visit.
Info::
Repeat visit: 0.10g CO2 (first visit: 1.30g)
First visit
4690 KB
Repeat visit
369 KB

92% reduction on repeat visits

Saving 1.20g CO2 per returning visitor

401 resources served from cache · 38 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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