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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
66
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
1.23g CO2 per view
FIX
1.23g CO2 per view
Warning::
1.23g CO2 per page view
This page transfers 4.4 MB, producing an estimated 1.23g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.23g, network 0.21g, end-user device 0.79g.
Got: 1.23g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 147.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 147.9 kg of CO2 annually — equivalent to charging 18488 smartphones.

1.23g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 32% of websites

Sustainable Web Design model v4 · Page size: 4.4 MB

Your site
1.23g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.23g
Network
0.21g
End-user device
0.79g
At 10,000 monthly views: Monthly: 12.3 kg · Annual: 147.9 kg · ≈ 18488 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

D
Carbon Budget
Action
68th percentile
FIX
68th percentile
Warning::
1.23g CO2 — above the median website (0.60g)
Heavier than an estimated 32% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 68th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.23g

68th percentile

Cleaner than 32% of websites

✗ Above the median website

vs Median 105% more
vs Target 147% more
B
Transfer Efficiency
81% efficient
REVIEW
81% efficient
Info::
Transfer efficiency: 81%
An estimated 847 KB (19%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 847 KB of unused JavaScript. This wasted data produces 0.23g of unnecessary CO2 per page view.
81% efficient

Total waste: 847 KB (19% of page weight)

Unused JS 847 KB

0.23g unnecessary CO2 per visit

Actual transfer 4456 KB
Theoretical minimum 3608 KB
Potential savings 847 KB (0.23g 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 83 KB (vs 4456 KB first visit). 179 of 187 resources are served from browser cache, saving 1.21g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.23g)
First visit
4456 KB
Repeat visit
83 KB

98% reduction on repeat visits

Saving 1.21g CO2 per returning visitor

179 resources served from cache · 8 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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