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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
60
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.44g CO2 per view
FIX
1.44g CO2 per view
Warning::
1.44g CO2 per page view
This page transfers 5.1 MB, producing an estimated 1.44g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.25g, end-user device 0.92g.
Got: 1.44g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 172.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 172.7 kg of CO2 annually — equivalent to charging 21585 smartphones.

1.44g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 27% of websites

Sustainable Web Design model v4 · Page size: 5.1 MB

Your site
1.44g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
0.25g
End-user device
0.92g
At 10,000 monthly views: Monthly: 14.4 kg · Annual: 172.7 kg · ≈ 21585 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 WordPress VIP✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
73th percentile
FIX
73th percentile
Warning::
1.44g CO2 — above the median website (0.60g)
Heavier than an estimated 27% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 73th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.44g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 140% more
vs Target 188% more
C
Transfer Efficiency
Action
67% efficient
REVIEW
67% efficient
Warning::
Transfer efficiency: 67%
An estimated 1735 KB (33%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1735 KB of unused JavaScript. This wasted data produces 0.48g of unnecessary CO2 per page view.
67% efficient

Total waste: 1735 KB (33% of page weight)

Unused JS 1735 KB

0.48g unnecessary CO2 per visit

Actual transfer 5203 KB
Theoretical minimum 3467 KB
Potential savings 1735 KB (0.48g 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
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 318 KB (vs 5203 KB first visit). 455 of 506 resources are served from browser cache, saving 1.35g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 1.44g)
First visit
5203 KB
Repeat visit
318 KB

94% reduction on repeat visits

Saving 1.35g CO2 per returning visitor

455 resources served from cache · 51 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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