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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
1.53g CO2 per view
FIX
1.53g CO2 per view
Warning::
1.53g CO2 per page view
This page transfers 5.4 MB, producing an estimated 1.53g 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: 1.53g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 183.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 183.6 kg of CO2 annually — equivalent to charging 22946 smartphones.

1.53g

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
1.53g
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: 15.3 kg · Annual: 183.6 kg · ≈ 22946 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::
1.53g 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

1.53g

76th percentile

Cleaner than 24% of websites

✗ Above the median website

vs Median 155% more
vs Target 206% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 613 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 613 KB of unused JavaScript. This wasted data produces 0.17g of unnecessary CO2 per page view.
89% efficient

Total waste: 613 KB (11% of page weight)

Unused JS 613 KB

0.17g unnecessary CO2 per visit

Actual transfer 5531 KB
Theoretical minimum 4918 KB
Potential savings 613 KB (0.17g 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
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 254 KB (vs 5531 KB first visit). 293 of 315 resources are served from browser cache, saving 1.46g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 1.53g)
First visit
5531 KB
Repeat visit
254 KB

95% reduction on repeat visits

Saving 1.46g CO2 per returning visitor

293 resources served from cache · 22 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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