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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
56
GRADE
D
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
1.75g CO2 per view
FIX
1.75g CO2 per view
Warning::
1.75g CO2 per page view
This page transfers 6.2 MB, producing an estimated 1.75g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.32g, network 0.30g, end-user device 1.12g.
Got: 1.75g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 209.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 209.7 kg of CO2 annually — equivalent to charging 26213 smartphones.

1.75g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 18% of websites

Sustainable Web Design model v4 · Page size: 6.2 MB

Your site
1.75g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.32g
Network
0.30g
End-user device
1.12g
At 10,000 monthly views: Monthly: 17.5 kg · Annual: 209.7 kg · ≈ 26213 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 Varnish✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
82th percentile
FIX
82th percentile
Warning::
1.75g CO2 — above the median website (0.60g)
Heavier than an estimated 18% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 82th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.75g

82nd percentile

Cleaner than 18% of websites

✗ Above the median website

vs Median 191% more
vs Target 250% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 676 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 676 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
89% efficient

Total waste: 676 KB (11% of page weight)

Unused JS 676 KB

0.19g unnecessary CO2 per visit

Actual transfer 6318 KB
Theoretical minimum 5641 KB
Potential savings 676 KB (0.19g 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 36 KB (vs 6318 KB first visit). 94 of 96 resources are served from browser cache, saving 1.74g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.75g)
First visit
6318 KB
Repeat visit
36 KB

99% reduction on repeat visits

Saving 1.74g CO2 per returning visitor

94 resources served from cache · 2 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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