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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
1.34g CO2 per view
FIX
1.34g CO2 per view
Warning::
1.34g CO2 per page view
This page transfers 4.7 MB, producing an estimated 1.34g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.25g, network 0.23g, end-user device 0.86g.
Got: 1.34g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 161.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 161.2 kg of CO2 annually — equivalent to charging 20153 smartphones.

1.34g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 29% of websites

Sustainable Web Design model v4 · Page size: 4.7 MB

Your site
1.34g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.25g
Network
0.23g
End-user device
0.86g
At 10,000 monthly views: Monthly: 13.4 kg · Annual: 161.2 kg · ≈ 20153 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
71th percentile
FIX
71th percentile
Warning::
1.34g CO2 — above the median website (0.60g)
Heavier than an estimated 29% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 71th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.34g

71st percentile

Cleaner than 29% of websites

✗ Above the median website

vs Median 124% more
vs Target 169% more
B
Transfer Efficiency
82% efficient
REVIEW
82% efficient
Info::
Transfer efficiency: 82%
An estimated 870 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 870 KB of unused JavaScript. This wasted data produces 0.24g of unnecessary CO2 per page view.
82% efficient

Total waste: 870 KB (18% of page weight)

Unused JS 870 KB

0.24g unnecessary CO2 per visit

Actual transfer 4858 KB
Theoretical minimum 3987 KB
Potential savings 870 KB (0.24g 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 71 KB (vs 4858 KB first visit). 99 of 101 resources are served from browser cache, saving 1.32g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.34g)
First visit
4858 KB
Repeat visit
71 KB

99% reduction on repeat visits

Saving 1.32g CO2 per returning visitor

99 resources served from cache · 2 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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