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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
53th percentile
FIX
53th percentile
Warning::
0.72g CO2 — above the median website (0.60g)
Heavier than an estimated 47% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 53th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.72g

53rd percentile

Cleaner than 47% of websites

✗ Above the median website

vs Median 21% more
vs Target 45% more
B
CO2 Per Page Load
0.72g CO2 per view
REVIEW
0.72g CO2 per view
Info::
0.72g CO2 per page view
This page transfers 2.6 MB, producing an estimated 0.72g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 0.13g, end-user device 0.47g.
Got: 0.72g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 86.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 86.9 kg of CO2 annually — equivalent to charging 10868 smartphones.

0.72g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 47% of websites

Sustainable Web Design model v4 · Page size: 2.6 MB

Your site
0.72g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.13g
Network
0.13g
End-user device
0.47g
At 10,000 monthly views: Monthly: 7.2 kg · Annual: 86.9 kg · ≈ 10868 smartphone charges
B
Transfer Efficiency
86% efficient
REVIEW
86% efficient
Info::
Transfer efficiency: 86%
An estimated 360 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 360 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
86% efficient

Total waste: 360 KB (14% of page weight)

Unused JS 360 KB

0.10g unnecessary CO2 per visit

Actual transfer 2619 KB
Theoretical minimum 2259 KB
Potential savings 360 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 43 KB (vs 2619 KB first visit). 66 of 68 resources are served from browser cache, saving 0.71g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.72g)
First visit
2619 KB
Repeat visit
43 KB

98% reduction on repeat visits

Saving 0.71g CO2 per returning visitor

66 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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