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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
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.09g CO2 per view
FIX
1.09g CO2 per view
Warning::
1.09g CO2 per page view
This page transfers 3.9 MB, producing an estimated 1.09g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.20g, network 0.19g, end-user device 0.70g.
Got: 1.09g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 131.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 131.4 kg of CO2 annually — equivalent to charging 16422 smartphones.

1.09g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 36% of websites

Sustainable Web Design model v4 · Page size: 3.9 MB

Your site
1.09g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.20g
Network
0.19g
End-user device
0.70g
At 10,000 monthly views: Monthly: 10.9 kg · Annual: 131.4 kg · ≈ 16422 smartphone charges
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
64th percentile
FIX
64th percentile
Warning::
1.09g CO2 — above the median website (0.60g)
Heavier than an estimated 36% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 64th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.09g

64th percentile

Cleaner than 36% of websites

✗ Above the median website

vs Median 82% more
vs Target 119% more
B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 667 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 667 KB of unused JavaScript. This wasted data produces 0.18g of unnecessary CO2 per page view.
83% efficient

Total waste: 667 KB (17% of page weight)

Unused JS 667 KB

0.18g unnecessary CO2 per visit

Actual transfer 3958 KB
Theoretical minimum 3291 KB
Potential savings 667 KB (0.18g 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 52 KB (vs 3958 KB first visit). 446 of 451 resources are served from browser cache, saving 1.08g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.09g)
First visit
3958 KB
Repeat visit
52 KB

99% reduction on repeat visits

Saving 1.08g CO2 per returning visitor

446 resources served from cache · 5 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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