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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
50
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
3.15g CO2 per view
FIX
3.15g CO2 per view
Critical::
3.15g CO2 per page view
This page transfers 11.1 MB, producing an estimated 3.15g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.58g, network 0.54g, end-user device 2.02g.
Got: 3.15g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 377.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 377.5 kg of CO2 annually — equivalent to charging 47184 smartphones.

3.15g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 11.1 MB

Your site
3.15g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.58g
Network
0.54g
End-user device
2.02g
At 10,000 monthly views: Monthly: 31.5 kg · Annual: 377.5 kg · ≈ 47184 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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.15g 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

3.15g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 424% more
vs Target 529% more
C
Transfer Efficiency
Action
75% efficient
REVIEW
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 2852 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2852 KB of unused JavaScript. This wasted data produces 0.79g of unnecessary CO2 per page view.
75% efficient

Total waste: 2852 KB (25% of page weight)

Unused JS 2852 KB

0.79g unnecessary CO2 per visit

Actual transfer 11373 KB
Theoretical minimum 8521 KB
Potential savings 2852 KB (0.79g 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 81 KB (vs 11373 KB first visit). 439 of 447 resources are served from browser cache, saving 3.12g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 3.15g)
First visit
11373 KB
Repeat visit
81 KB

99% reduction on repeat visits

Saving 3.12g CO2 per returning visitor

439 resources served from cache · 8 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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