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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
68
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.16g CO2 per view
FIX
1.16g CO2 per view
Warning::
1.16g CO2 per page view
This page transfers 4.1 MB, producing an estimated 1.16g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.22g, network 0.20g, end-user device 0.75g.
Got: 1.16g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 139.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 139.7 kg of CO2 annually — equivalent to charging 17464 smartphones.

1.16g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 34% of websites

Sustainable Web Design model v4 · Page size: 4.1 MB

Your site
1.16g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.22g
Network
0.20g
End-user device
0.75g
At 10,000 monthly views: Monthly: 11.6 kg · Annual: 139.7 kg · ≈ 17464 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 Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
66th percentile
FIX
66th percentile
Warning::
1.16g CO2 — above the median website (0.60g)
Heavier than an estimated 34% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 66th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.16g

66th percentile

Cleaner than 34% of websites

✗ Above the median website

vs Median 94% more
vs Target 133% 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 90 KB (vs 4209 KB first visit). 139 of 141 resources are served from browser cache, saving 1.14g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.16g)
First visit
4209 KB
Repeat visit
90 KB

98% reduction on repeat visits

Saving 1.14g CO2 per returning visitor

139 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 230 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 230 KB (5% of page weight)

Unused JS 230 KB

0.06g unnecessary CO2 per visit

Actual transfer 4209 KB
Theoretical minimum 3979 KB
Potential savings 230 KB (0.06g 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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