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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
2
REVIEW
3
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 3 REVIEW 2 FIX
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
Transfer Efficiency
Action
56% efficient
FIX
56% efficient
Warning::
Transfer efficiency: 56%
An estimated 929 KB (44%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 929 KB of unused JavaScript. This wasted data produces 0.26g of unnecessary CO2 per page view.
56% efficient

Total waste: 929 KB (44% of page weight)

Unused JS 929 KB

0.26g unnecessary CO2 per visit

Actual transfer 2134 KB
Theoretical minimum 1205 KB
Potential savings 929 KB (0.26g CO2)

See Deep Analysis sections above for specific optimizations.

B
CO2 Per Page Load
0.59g CO2 per view
REVIEW
0.59g CO2 per view
Info::
0.59g CO2 per page view
This page transfers 2.1 MB, producing an estimated 0.59g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.10g, end-user device 0.38g.
Got: 0.59g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 70.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 70.9 kg of CO2 annually — equivalent to charging 8856 smartphones.

0.59g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 51% of websites

Sustainable Web Design model v4 · Page size: 2.1 MB

Your site
0.59g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.11g
Network
0.10g
End-user device
0.38g
At 10,000 monthly views: Monthly: 5.9 kg · Annual: 70.9 kg · ≈ 8856 smartphone charges
B
Carbon Budget
49th percentile
REVIEW
49th percentile
Info::
0.59g CO2 — below the median website (0.60g)
Better than an estimated 51% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 49th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.59g

49th percentile

Cleaner than 51% of websites

✗ Above the median website

vs Median 2% cleaner ✓
vs Target 18% 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 27 KB (vs 2134 KB first visit). 101 of 102 resources are served from browser cache, saving 0.58g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.59g)
First visit
2134 KB
Repeat visit
27 KB

99% reduction on repeat visits

Saving 0.58g CO2 per returning visitor

101 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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