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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
1.31g CO2 per view
FIX
1.31g CO2 per view
Warning::
1.31g CO2 per page view
This page transfers 4.6 MB, producing an estimated 1.31g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.24g, network 0.23g, end-user device 0.84g.
Got: 1.31g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 157.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 157.3 kg of CO2 annually — equivalent to charging 19668 smartphones.

1.31g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 30% of websites

Sustainable Web Design model v4 · Page size: 4.6 MB

Your site
1.31g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.24g
Network
0.23g
End-user device
0.84g
At 10,000 monthly views: Monthly: 13.1 kg · Annual: 157.3 kg · ≈ 19668 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::
Azure: Microsoft is carbon-negative; Azure renewable varies by region
Info::
Azure CDN: Inherits Azure regional renewable mix
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 Azure✗CDN Azure CDN✗

Azure: Microsoft is carbon-negative; Azure renewable varies by region

Azure CDN: Inherits Azure regional renewable mix

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
70th percentile
FIX
70th percentile
Warning::
1.31g CO2 — above the median website (0.60g)
Heavier than an estimated 30% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 70th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.31g

70th percentile

Cleaner than 30% of websites

✗ Above the median website

vs Median 119% more
vs Target 162% more
C
Transfer Efficiency
Action
64% efficient
REVIEW
64% efficient
Warning::
Transfer efficiency: 64%
An estimated 1728 KB (36%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1728 KB of unused JavaScript. This wasted data produces 0.48g of unnecessary CO2 per page view.
64% efficient

Total waste: 1728 KB (36% of page weight)

Unused JS 1728 KB

0.48g unnecessary CO2 per visit

Actual transfer 4741 KB
Theoretical minimum 3012 KB
Potential savings 1728 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 102 KB (vs 4741 KB first visit). 166 of 170 resources are served from browser cache, saving 1.28g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.31g)
First visit
4741 KB
Repeat visit
102 KB

98% reduction on repeat visits

Saving 1.28g CO2 per returning visitor

166 resources served from cache · 4 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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