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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
52th percentile
FIX
52th percentile
Warning::
0.69g CO2 — above the median website (0.60g)
Heavier than an estimated 48% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 52th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.69g

52nd percentile

Cleaner than 48% of websites

✗ Above the median website

vs Median 14% more
vs Target 37% more
B
CO2 Per Page Load
0.69g CO2 per view
REVIEW
0.69g CO2 per view
Info::
0.69g CO2 per page view
This page transfers 2.4 MB, producing an estimated 0.69g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 0.12g, end-user device 0.44g.
Got: 0.69g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 82.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 82.2 kg of CO2 annually — equivalent to charging 10280 smartphones.

0.69g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 48% of websites

Sustainable Web Design model v4 · Page size: 2.4 MB

Your site
0.69g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.13g
Network
0.12g
End-user device
0.44g
At 10,000 monthly views: Monthly: 6.9 kg · Annual: 82.2 kg · ≈ 10280 smartphone charges
B
Transfer Efficiency
78% efficient
REVIEW
78% efficient
Info::
Transfer efficiency: 78%
An estimated 542 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 542 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
78% efficient

Total waste: 542 KB (22% of page weight)

Unused JS 542 KB

0.15g unnecessary CO2 per visit

Actual transfer 2478 KB
Theoretical minimum 1935 KB
Potential savings 542 KB (0.15g 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
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 126 KB (vs 2478 KB first visit). 300 of 313 resources are served from browser cache, saving 0.65g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.69g)
First visit
2478 KB
Repeat visit
126 KB

95% reduction on repeat visits

Saving 0.65g CO2 per returning visitor

300 resources served from cache · 13 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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