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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
64
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
0.98g CO2 per view
FIX
0.98g CO2 per view
Info::
0.98g CO2 per page view
This page transfers 3.4 MB, producing an estimated 0.98g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.18g, network 0.17g, end-user device 0.63g.
Got: 0.98g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 117.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 117.2 kg of CO2 annually — equivalent to charging 14652 smartphones.

0.98g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 40% of websites

Sustainable Web Design model v4 · Page size: 3.4 MB

Your site
0.98g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.18g
Network
0.17g
End-user device
0.63g
At 10,000 monthly views: Monthly: 9.8 kg · Annual: 117.2 kg · ≈ 14652 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 Angie✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
60th percentile
FIX
60th percentile
Warning::
0.98g CO2 — above the median website (0.60g)
Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 60th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.98g

60th percentile

Cleaner than 40% of websites

✗ Above the median website

vs Median 63% more
vs Target 95% more
B
Transfer Efficiency
84% efficient
REVIEW
84% efficient
Info::
Transfer efficiency: 84%
An estimated 578 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 578 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.
84% efficient

Total waste: 578 KB (16% of page weight)

Unused JS 578 KB

0.16g unnecessary CO2 per visit

Actual transfer 3532 KB
Theoretical minimum 2953 KB
Potential savings 578 KB (0.16g 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 124 KB (vs 3532 KB first visit). 289 of 294 resources are served from browser cache, saving 0.94g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.98g)
First visit
3532 KB
Repeat visit
124 KB

96% reduction on repeat visits

Saving 0.94g CO2 per returning visitor

289 resources served from cache · 5 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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