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https://americanexpress.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
78
GRADE
C
FIX
1
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 2 REVIEW 1 FIX
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::
Akamai: Committed to 50% renewable by 2030
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 Not identified✗CDN Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Transfer Efficiency
85% efficient
REVIEW
85% efficient
Info::
Transfer efficiency: 85%
An estimated 195 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 195 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.
85% efficient

Total waste: 195 KB (15% of page weight)

Unused JS 195 KB

0.05g unnecessary CO2 per visit

Actual transfer 1287 KB
Theoretical minimum 1091 KB
Potential savings 195 KB (0.05g 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
CO2 Per Page Load
0.36g CO2 per view
PASS
0.36g CO2 per view
Info::
0.36g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.36g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.06g, end-user device 0.23g.
Got: 0.36g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 42.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 42.7 kg of CO2 annually — equivalent to charging 5340 smartphones.

0.36g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 75% of websites

Sustainable Web Design model v4 · Page size: 1.3 MB

Your site
0.36g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.07g
Network
0.06g
End-user device
0.23g
At 10,000 monthly views: Monthly: 3.6 kg · Annual: 42.7 kg · ≈ 5340 smartphone charges
A+
Repeat Visit Weight
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 98 KB (vs 1287 KB first visit). 75 of 77 resources are served from browser cache, saving 0.33g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.36g)
First visit
1287 KB
Repeat visit
98 KB

92% reduction on repeat visits

Saving 0.33g CO2 per returning visitor

75 resources served from cache · 2 resources re-downloaded

A
Carbon Budget
25th percentile
PASS
25th percentile
Info::
0.36g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 75% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 25th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.36g

25th percentile

Cleaner than 75% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 41% cleaner ✓
vs Target 29% cleaner ✓
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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