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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
62
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.95g CO2 per view
FIX
1.95g CO2 per view
Warning::
1.95g CO2 per page view
This page transfers 6.9 MB, producing an estimated 1.95g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.36g, network 0.34g, end-user device 1.25g.
Got: 1.95g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 233.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 233.7 kg of CO2 annually — equivalent to charging 29214 smartphones.

1.95g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 12% of websites

Sustainable Web Design model v4 · Page size: 6.9 MB

Your site
1.95g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.36g
Network
0.34g
End-user device
1.25g
At 10,000 monthly views: Monthly: 19.5 kg · Annual: 233.7 kg · ≈ 29214 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
88th percentile
FIX
88th percentile
Warning::
1.95g CO2 — above the median website (0.60g)
Heavier than an estimated 12% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 88th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.95g

88th percentile

Cleaner than 12% of websites

✗ Above the median website

vs Median 225% more
vs Target 290% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 204 KB (vs 7042 KB first visit). 160 of 165 resources are served from browser cache, saving 1.89g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.95g)
First visit
7042 KB
Repeat visit
204 KB

97% reduction on repeat visits

Saving 1.89g CO2 per returning visitor

160 resources served from cache · 5 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 506 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 506 KB (7% of page weight)

Unused JS 506 KB

0.14g unnecessary CO2 per visit

Actual transfer 7042 KB
Theoretical minimum 6535 KB
Potential savings 506 KB (0.14g CO2)

See Deep Analysis sections above for specific optimizations.

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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