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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
62
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
1.47g CO2 per view
FIX
1.47g CO2 per view
Warning::
1.47g CO2 per page view
This page transfers 5.2 MB, producing an estimated 1.47g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.25g, end-user device 0.95g.
Got: 1.47g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 176.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 176.7 kg of CO2 annually — equivalent to charging 22091 smartphones.

1.47g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 26% of websites

Sustainable Web Design model v4 · Page size: 5.2 MB

Your site
1.47g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
0.25g
End-user device
0.95g
At 10,000 monthly views: Monthly: 14.7 kg · Annual: 176.7 kg · ≈ 22091 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
74th percentile
FIX
74th percentile
Warning::
1.47g CO2 — above the median website (0.60g)
Heavier than an estimated 26% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 74th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.47g

74th percentile

Cleaner than 26% of websites

✗ Above the median website

vs Median 145% more
vs Target 195% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 569 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 569 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.
89% efficient

Total waste: 569 KB (11% of page weight)

Unused JS 569 KB

0.16g unnecessary CO2 per visit

Actual transfer 5325 KB
Theoretical minimum 4755 KB
Potential savings 569 KB (0.16g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 183 KB (vs 5325 KB first visit). 244 of 249 resources are served from browser cache, saving 1.42g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 1.47g)
First visit
5325 KB
Repeat visit
183 KB

97% reduction on repeat visits

Saving 1.42g CO2 per returning visitor

244 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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