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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
52
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
3.84g CO2 per view
FIX
3.84g CO2 per view
Critical::
3.84g CO2 per page view
This page transfers 13.5 MB, producing an estimated 3.84g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.71g, network 0.66g, end-user device 2.46g.
Got: 3.84g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 460.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 460.3 kg of CO2 annually — equivalent to charging 57533 smartphones.

3.84g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 13.5 MB

Your site
3.84g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.71g
Network
0.66g
End-user device
2.46g
At 10,000 monthly views: Monthly: 38.4 kg · Annual: 460.3 kg · ≈ 57533 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

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.84g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

3.84g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 539% more
vs Target 667% more
B
Transfer Efficiency
87% efficient
REVIEW
87% efficient
Info::
Transfer efficiency: 87%
An estimated 1872 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1872 KB of unused JavaScript. This wasted data produces 0.52g of unnecessary CO2 per page view.
87% efficient

Total waste: 1872 KB (13% of page weight)

Unused JS 1872 KB

0.52g unnecessary CO2 per visit

Actual transfer 13868 KB
Theoretical minimum 11996 KB
Potential savings 1872 KB (0.52g 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 78 KB (vs 13868 KB first visit). 222 of 225 resources are served from browser cache, saving 3.81g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 3.84g)
First visit
13868 KB
Repeat visit
78 KB

99% reduction on repeat visits

Saving 3.81g CO2 per returning visitor

222 resources served from cache · 3 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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