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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
70
GRADE
C
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
Carbon Budget
Action
54th percentile
FIX
54th percentile
Warning::
0.74g CO2 — above the median website (0.60g)
Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 54th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.74g

54th percentile

Cleaner than 46% of websites

✗ Above the median website

vs Median 24% more
vs Target 49% more
B
CO2 Per Page Load
0.74g CO2 per view
REVIEW
0.74g CO2 per view
Info::
0.74g CO2 per page view
This page transfers 2.6 MB, producing an estimated 0.74g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 0.13g, end-user device 0.48g.
Got: 0.74g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 89.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 89.2 kg of CO2 annually — equivalent to charging 11146 smartphones.

0.74g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 46% of websites

Sustainable Web Design model v4 · Page size: 2.6 MB

Your site
0.74g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.14g
Network
0.13g
End-user device
0.48g
At 10,000 monthly views: Monthly: 7.4 kg · Annual: 89.2 kg · ≈ 11146 smartphone charges
B
Transfer Efficiency
87% efficient
REVIEW
87% efficient
Info::
Transfer efficiency: 87%
An estimated 344 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 344 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
87% efficient

Total waste: 344 KB (13% of page weight)

Unused JS 344 KB

0.10g unnecessary CO2 per visit

Actual transfer 2686 KB
Theoretical minimum 2342 KB
Potential savings 344 KB (0.10g 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 28 KB (vs 2686 KB first visit). 108 of 112 resources are served from browser cache, saving 0.74g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.74g)
First visit
2686 KB
Repeat visit
28 KB

99% reduction on repeat visits

Saving 0.74g CO2 per returning visitor

108 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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