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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
54
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.75g CO2 per view
FIX
1.75g CO2 per view
Warning::
1.75g CO2 per page view
This page transfers 6.2 MB, producing an estimated 1.75g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.32g, network 0.30g, end-user device 1.12g.
Got: 1.75g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 210.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 210.0 kg of CO2 annually — equivalent to charging 26254 smartphones.

1.75g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 18% of websites

Sustainable Web Design model v4 · Page size: 6.2 MB

Your site
1.75g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.32g
Network
0.30g
End-user device
1.12g
At 10,000 monthly views: Monthly: 17.5 kg · Annual: 210.0 kg · ≈ 26254 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their 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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
82th percentile
FIX
82th percentile
Warning::
1.75g CO2 — above the median website (0.60g)
Heavier than an estimated 18% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 82th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.75g

82nd percentile

Cleaner than 18% of websites

✗ Above the median website

vs Median 192% more
vs Target 250% more
C
Transfer Efficiency
Action
67% efficient
REVIEW
67% efficient
Warning::
Transfer efficiency: 67%
An estimated 2071 KB (33%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2071 KB of unused JavaScript. This wasted data produces 0.57g of unnecessary CO2 per page view.
67% efficient

Total waste: 2071 KB (33% of page weight)

Unused JS 2071 KB

0.57g unnecessary CO2 per visit

Actual transfer 6328 KB
Theoretical minimum 4256 KB
Potential savings 2071 KB (0.57g 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 7 KB (vs 6328 KB first visit). 35 of 36 resources are served from browser cache, saving 1.75g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.75g)
First visit
6328 KB
Repeat visit
7 KB

100% reduction on repeat visits

Saving 1.75g CO2 per returning visitor

35 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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