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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
49
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
2.58g CO2 per view
FIX
2.58g CO2 per view
Critical::
2.58g CO2 per page view
This page transfers 9.1 MB, producing an estimated 2.58g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.48g, network 0.45g, end-user device 1.66g.
Got: 2.58g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 309.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 309.9 kg of CO2 annually — equivalent to charging 38740 smartphones.

2.58g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 9.1 MB

Your site
2.58g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.48g
Network
0.45g
End-user device
1.66g
At 10,000 monthly views: Monthly: 25.8 kg · Annual: 309.9 kg · ≈ 38740 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 Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.58g 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

2.58g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 330% more
vs Target 417% more
C
Transfer Efficiency
Action
74% efficient
REVIEW
74% efficient
Warning::
Transfer efficiency: 74%
An estimated 2399 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2399 KB of unused JavaScript. This wasted data produces 0.66g of unnecessary CO2 per page view.
74% efficient

Total waste: 2399 KB (26% of page weight)

Unused JS 2399 KB

0.66g unnecessary CO2 per visit

Actual transfer 9338 KB
Theoretical minimum 6939 KB
Potential savings 2399 KB (0.66g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 277 KB (vs 9338 KB first visit). 264 of 272 resources are served from browser cache, saving 2.51g CO2 per repeat visit.
Info::
Repeat visit: 0.08g CO2 (first visit: 2.58g)
First visit
9338 KB
Repeat visit
277 KB

97% reduction on repeat visits

Saving 2.51g CO2 per returning visitor

264 resources served from cache · 8 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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