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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
1.79g CO2 per view
FIX
1.79g CO2 per view
Warning::
1.79g CO2 per page view
This page transfers 6.3 MB, producing an estimated 1.79g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.33g, network 0.31g, end-user device 1.15g.
Got: 1.79g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 214.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 214.4 kg of CO2 annually — equivalent to charging 26794 smartphones.

1.79g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 17% of websites

Sustainable Web Design model v4 · Page size: 6.3 MB

Your site
1.79g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.33g
Network
0.31g
End-user device
1.15g
At 10,000 monthly views: Monthly: 17.9 kg · Annual: 214.4 kg · ≈ 26794 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
83th percentile
FIX
83th percentile
Warning::
1.79g CO2 — above the median website (0.60g)
Heavier than an estimated 17% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 83th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.79g

83rd percentile

Cleaner than 17% of websites

✗ Above the median website

vs Median 198% more
vs Target 257% more
B
Transfer Efficiency
90% efficient
REVIEW
90% efficient
Info::
Transfer efficiency: 90%
An estimated 659 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 659 KB of unused JavaScript. This wasted data produces 0.18g of unnecessary CO2 per page view.
90% efficient

Total waste: 659 KB (10% of page weight)

Unused JS 659 KB

0.18g unnecessary CO2 per visit

Actual transfer 6458 KB
Theoretical minimum 5799 KB
Potential savings 659 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 92 KB (vs 6458 KB first visit). 183 of 189 resources are served from browser cache, saving 1.76g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.79g)
First visit
6458 KB
Repeat visit
92 KB

99% reduction on repeat visits

Saving 1.76g CO2 per returning visitor

183 resources served from cache · 6 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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