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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
F
CO2 Per Page Load
Action
1.52g CO2 per view
FIX
1.52g CO2 per view
Warning::
1.52g CO2 per page view
This page transfers 5.4 MB, producing an estimated 1.52g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.26g, end-user device 0.98g.
Got: 1.52g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 182.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 182.4 kg of CO2 annually — equivalent to charging 22796 smartphones.

1.52g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 24% of websites

Sustainable Web Design model v4 · Page size: 5.4 MB

Your site
1.52g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.28g
Network
0.26g
End-user device
0.98g
At 10,000 monthly views: Monthly: 15.2 kg · Annual: 182.4 kg · ≈ 22796 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
76th percentile
FIX
76th percentile
Warning::
1.52g CO2 — above the median website (0.60g)
Heavier than an estimated 24% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 76th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.52g

76th percentile

Cleaner than 24% of websites

✗ Above the median website

vs Median 153% more
vs Target 204% more
B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 930 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 930 KB of unused JavaScript. This wasted data produces 0.26g of unnecessary CO2 per page view.
83% efficient

Total waste: 930 KB (17% of page weight)

Unused JS 930 KB

0.26g unnecessary CO2 per visit

Actual transfer 5495 KB
Theoretical minimum 4564 KB
Potential savings 930 KB (0.26g 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 96 KB (vs 5495 KB first visit). 158 of 159 resources are served from browser cache, saving 1.49g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.52g)
First visit
5495 KB
Repeat visit
96 KB

98% reduction on repeat visits

Saving 1.49g CO2 per returning visitor

158 resources served from cache · 1 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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