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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
60
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.01g CO2 per view
FIX
2.01g CO2 per view
Critical::
2.01g CO2 per page view
This page transfers 7.1 MB, producing an estimated 2.01g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.37g, network 0.35g, end-user device 1.29g.
Got: 2.01g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 241.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 241.0 kg of CO2 annually — equivalent to charging 30130 smartphones.

2.01g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 7.1 MB

Your site
2.01g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.37g
Network
0.35g
End-user device
1.29g
At 10,000 monthly views: Monthly: 20.1 kg · Annual: 241.0 kg · ≈ 30130 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::
Azure: Microsoft is carbon-negative; Azure renewable varies by region
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 Azure✗CDN Akamai✗

Azure: Microsoft is carbon-negative; Azure renewable varies by region

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::
2.01g 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

2.01g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 235% more
vs Target 302% more
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 64 KB (vs 7263 KB first visit). 102 of 105 resources are served from browser cache, saving 1.99g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.01g)
First visit
7263 KB
Repeat visit
64 KB

99% reduction on repeat visits

Saving 1.99g CO2 per returning visitor

102 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 161 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 161 KB (2% of page weight)

Unused JS 161 KB

0.04g unnecessary CO2 per visit

Actual transfer 7263 KB
Theoretical minimum 7101 KB
Potential savings 161 KB (0.04g CO2)

See Deep Analysis sections above for specific optimizations.

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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