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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
58
GRADE
D
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
2.46g CO2 per view
FIX
2.46g CO2 per view
Critical::
2.46g CO2 per page view
This page transfers 8.7 MB, producing an estimated 2.46g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.46g, network 0.43g, end-user device 1.58g.
Got: 2.46g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 295.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 295.3 kg of CO2 annually — equivalent to charging 36911 smartphones.

2.46g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.7 MB

Your site
2.46g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.46g
Network
0.43g
End-user device
1.58g
At 10,000 monthly views: Monthly: 24.6 kg · Annual: 295.3 kg · ≈ 36911 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::
2.46g 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

2.46g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 310% more
vs Target 392% more
B
Transfer Efficiency
84% efficient
REVIEW
84% efficient
Info::
Transfer efficiency: 84%
An estimated 1405 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1405 KB of unused JavaScript. This wasted data produces 0.39g of unnecessary CO2 per page view.
84% efficient

Total waste: 1405 KB (16% of page weight)

Unused JS 1405 KB

0.39g unnecessary CO2 per visit

Actual transfer 8897 KB
Theoretical minimum 7491 KB
Potential savings 1405 KB (0.39g 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 179 KB (vs 8897 KB first visit). 166 of 171 resources are served from browser cache, saving 2.41g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 2.46g)
First visit
8897 KB
Repeat visit
179 KB

98% reduction on repeat visits

Saving 2.41g CO2 per returning visitor

166 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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