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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
53
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
2.78g CO2 per view
FIX
2.78g CO2 per view
Critical::
2.78g CO2 per page view
This page transfers 9.8 MB, producing an estimated 2.78g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.51g, network 0.48g, end-user device 1.79g.
Got: 2.78g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 333.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 333.7 kg of CO2 annually — equivalent to charging 41707 smartphones.

2.78g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 9.8 MB

Your site
2.78g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.51g
Network
0.48g
End-user device
1.79g
At 10,000 monthly views: Monthly: 27.8 kg · Annual: 333.7 kg · ≈ 41707 smartphone charges
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Not identified✗CDN Varnish✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.78g 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

2.78g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 363% more
vs Target 456% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 1082 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1082 KB of unused JavaScript. This wasted data produces 0.30g of unnecessary CO2 per page view.
89% efficient

Total waste: 1082 KB (11% of page weight)

Unused JS 1082 KB

0.30g unnecessary CO2 per visit

Actual transfer 10053 KB
Theoretical minimum 8970 KB
Potential savings 1082 KB (0.30g 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
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 434 KB (vs 10053 KB first visit). 654 of 760 resources are served from browser cache, saving 2.66g CO2 per repeat visit.
Info::
Repeat visit: 0.12g CO2 (first visit: 2.78g)
First visit
10053 KB
Repeat visit
434 KB

96% reduction on repeat visits

Saving 2.66g CO2 per returning visitor

654 resources served from cache · 106 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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