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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
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
0.88g CO2 per view
FIX
0.88g CO2 per view
Info::
0.88g CO2 per page view
This page transfers 3.1 MB, producing an estimated 0.88g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.16g, network 0.15g, end-user device 0.56g.
Got: 0.88g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 105.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 105.6 kg of CO2 annually — equivalent to charging 13194 smartphones.

0.88g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 43% of websites

Sustainable Web Design model v4 · Page size: 3.1 MB

Your site
0.88g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.16g
Network
0.15g
End-user device
0.56g
At 10,000 monthly views: Monthly: 8.8 kg · Annual: 105.6 kg · ≈ 13194 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
57th percentile
FIX
57th percentile
Warning::
0.88g CO2 — above the median website (0.60g)
Heavier than an estimated 43% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 57th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.88g

57th percentile

Cleaner than 43% of websites

✗ Above the median website

vs Median 47% more
vs Target 76% more
C
Transfer Efficiency
Action
61% efficient
REVIEW
61% efficient
Warning::
Transfer efficiency: 61%
An estimated 1242 KB (39%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1242 KB of unused JavaScript. This wasted data produces 0.34g of unnecessary CO2 per page view.
61% efficient

Total waste: 1242 KB (39% of page weight)

Unused JS 1242 KB

0.34g unnecessary CO2 per visit

Actual transfer 3180 KB
Theoretical minimum 1938 KB
Potential savings 1242 KB (0.34g 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
91% cached
PASS
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 301 KB (vs 3180 KB first visit). 137 of 141 resources are served from browser cache, saving 0.80g CO2 per repeat visit.
Info::
Repeat visit: 0.08g CO2 (first visit: 0.88g)
First visit
3180 KB
Repeat visit
301 KB

91% reduction on repeat visits

Saving 0.80g CO2 per returning visitor

137 resources served from cache · 4 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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