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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
56
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
1.49g CO2 per view
FIX
1.49g CO2 per view
Warning::
1.49g CO2 per page view
This page transfers 5.2 MB, producing an estimated 1.49g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.26g, end-user device 0.95g.
Got: 1.49g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 178.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 178.3 kg of CO2 annually — equivalent to charging 22283 smartphones.

1.49g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 25% of websites

Sustainable Web Design model v4 · Page size: 5.2 MB

Your site
1.49g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.28g
Network
0.26g
End-user device
0.95g
At 10,000 monthly views: Monthly: 14.9 kg · Annual: 178.3 kg · ≈ 22283 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::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
75th percentile
FIX
75th percentile
Warning::
1.49g CO2 — above the median website (0.60g)
Heavier than an estimated 25% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 75th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.49g

75th percentile

Cleaner than 25% of websites

✗ Above the median website

vs Median 148% more
vs Target 197% more
C
Transfer Efficiency
Action
64% efficient
REVIEW
64% efficient
Warning::
Transfer efficiency: 64%
An estimated 1939 KB (36%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1939 KB of unused JavaScript. This wasted data produces 0.54g of unnecessary CO2 per page view.
64% efficient

Total waste: 1939 KB (36% of page weight)

Unused JS 1939 KB

0.54g unnecessary CO2 per visit

Actual transfer 5371 KB
Theoretical minimum 3431 KB
Potential savings 1939 KB (0.54g 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 155 KB (vs 5371 KB first visit). 236 of 256 resources are served from browser cache, saving 1.44g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.49g)
First visit
5371 KB
Repeat visit
155 KB

97% reduction on repeat visits

Saving 1.44g CO2 per returning visitor

236 resources served from cache · 20 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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