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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
49
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.08g CO2 per view
FIX
2.08g CO2 per view
Critical::
2.08g CO2 per page view
This page transfers 7.4 MB, producing an estimated 2.08g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.39g, network 0.36g, end-user device 1.34g.
Got: 2.08g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 249.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 249.9 kg of CO2 annually — equivalent to charging 31236 smartphones.

2.08g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 7.4 MB

Your site
2.08g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.39g
Network
0.36g
End-user device
1.34g
At 10,000 monthly views: Monthly: 20.8 kg · Annual: 249.9 kg · ≈ 31236 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::
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

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.08g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.08g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 247% more
vs Target 316% more
C
Transfer Efficiency
Action
61% efficient
REVIEW
61% efficient
Warning::
Transfer efficiency: 61%
An estimated 2939 KB (39%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2939 KB of unused JavaScript. This wasted data produces 0.81g of unnecessary CO2 per page view.
61% efficient

Total waste: 2939 KB (39% of page weight)

Unused JS 2939 KB

0.81g unnecessary CO2 per visit

Actual transfer 7529 KB
Theoretical minimum 4590 KB
Potential savings 2939 KB (0.81g 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 198 KB (vs 7529 KB first visit). 339 of 350 resources are served from browser cache, saving 2.03g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 2.08g)
First visit
7529 KB
Repeat visit
198 KB

97% reduction on repeat visits

Saving 2.03g CO2 per returning visitor

339 resources served from cache · 11 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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