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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::
0.71g 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

0.71g

53rd percentile

Cleaner than 47% of websites

✗ Above the median website

vs Median 18% more
vs Target 42% more
B
CO2 Per Page Load
0.71g CO2 per view
REVIEW
0.71g CO2 per view
Info::
0.71g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.71g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 0.12g, end-user device 0.45g.
Got: 0.71g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 85.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 85.0 kg of CO2 annually — equivalent to charging 10625 smartphones.

0.71g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 47% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

Your site
0.71g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.13g
Network
0.12g
End-user device
0.45g
At 10,000 monthly views: Monthly: 7.1 kg · Annual: 85.0 kg · ≈ 10625 smartphone charges
B
Transfer Efficiency
87% efficient
REVIEW
87% efficient
Info::
Transfer efficiency: 87%
An estimated 330 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 330 KB of unused JavaScript. This wasted data produces 0.09g of unnecessary CO2 per page view.
87% efficient

Total waste: 330 KB (13% of page weight)

Unused JS 330 KB

0.09g unnecessary CO2 per visit

Actual transfer 2561 KB
Theoretical minimum 2230 KB
Potential savings 330 KB (0.09g 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 40 KB (vs 2561 KB first visit). 52 of 53 resources are served from browser cache, saving 0.70g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.71g)
First visit
2561 KB
Repeat visit
40 KB

98% reduction on repeat visits

Saving 0.70g CO2 per returning visitor

52 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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