Skip to content
https://eib.org

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
1.32g CO2 per view
FIX
1.32g CO2 per view
Warning::
1.32g CO2 per page view
This page transfers 4.7 MB, producing an estimated 1.32g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.24g, network 0.23g, end-user device 0.85g.
Got: 1.32g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 158.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 158.5 kg of CO2 annually — equivalent to charging 19813 smartphones.

1.32g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 30% of websites

Sustainable Web Design model v4 · Page size: 4.7 MB

Your site
1.32g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.24g
Network
0.23g
End-user device
0.85g
At 10,000 monthly views: Monthly: 13.2 kg · Annual: 158.5 kg · ≈ 19813 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 Akamai Connected Cloud✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
70th percentile
FIX
70th percentile
Warning::
1.32g 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

1.32g

70th percentile

Cleaner than 30% of websites

✗ Above the median website

vs Median 120% more
vs Target 164% more
B
Transfer Efficiency
80% efficient
REVIEW
80% efficient
Info::
Transfer efficiency: 80%
An estimated 951 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 951 KB of unused JavaScript. This wasted data produces 0.26g of unnecessary CO2 per page view.
80% efficient

Total waste: 951 KB (20% of page weight)

Unused JS 951 KB

0.26g unnecessary CO2 per visit

Actual transfer 4776 KB
Theoretical minimum 3824 KB
Potential savings 951 KB (0.26g 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 62 KB (vs 4776 KB first visit). 120 of 124 resources are served from browser cache, saving 1.30g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.32g)
First visit
4776 KB
Repeat visit
62 KB

99% reduction on repeat visits

Saving 1.30g CO2 per returning visitor

120 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.

Send Feedback