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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
51
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
2.25g CO2 per view
FIX
2.25g CO2 per view
Critical::
2.25g CO2 per page view
This page transfers 7.9 MB, producing an estimated 2.25g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.42g, network 0.39g, end-user device 1.44g.
Got: 2.25g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 269.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 269.7 kg of CO2 annually — equivalent to charging 33713 smartphones.

2.25g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 7.9 MB

Your site
2.25g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.42g
Network
0.39g
End-user device
1.44g
At 10,000 monthly views: Monthly: 22.5 kg · Annual: 269.7 kg · ≈ 33713 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::
2.25g 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

2.25g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 275% more
vs Target 350% more
C
Transfer Efficiency
Action
72% efficient
REVIEW
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 2258 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2258 KB of unused JavaScript. This wasted data produces 0.62g of unnecessary CO2 per page view.
72% efficient

Total waste: 2258 KB (28% of page weight)

Unused JS 2258 KB

0.62g unnecessary CO2 per visit

Actual transfer 8126 KB
Theoretical minimum 5867 KB
Potential savings 2258 KB (0.62g 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 43 KB (vs 8126 KB first visit). 381 of 382 resources are served from browser cache, saving 2.24g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.25g)
First visit
8126 KB
Repeat visit
43 KB

99% reduction on repeat visits

Saving 2.24g CO2 per returning visitor

381 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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