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https://stuff.co.nz

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
D
CO2 Per Page Load
Action
1.41g CO2 per view
FIX
1.41g CO2 per view
Warning::
1.41g CO2 per page view
This page transfers 5.0 MB, producing an estimated 1.41g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.26g, network 0.24g, end-user device 0.90g.
Got: 1.41g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 168.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 168.8 kg of CO2 annually — equivalent to charging 21099 smartphones.

1.41g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 27% of websites

Sustainable Web Design model v4 · Page size: 5.0 MB

Your site
1.41g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.26g
Network
0.24g
End-user device
0.90g
At 10,000 monthly views: Monthly: 14.1 kg · Annual: 168.8 kg · ≈ 21099 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::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
73th percentile
FIX
73th percentile
Warning::
1.41g CO2 — above the median website (0.60g)
Heavier than an estimated 27% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 73th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.41g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 134% more
vs Target 181% more
C
Transfer Efficiency
Action
65% efficient
REVIEW
65% efficient
Warning::
Transfer efficiency: 65%
An estimated 1783 KB (35%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1783 KB of unused JavaScript. This wasted data produces 0.49g of unnecessary CO2 per page view.
65% efficient

Total waste: 1783 KB (35% of page weight)

Unused JS 1783 KB

0.49g unnecessary CO2 per visit

Actual transfer 5086 KB
Theoretical minimum 3302 KB
Potential savings 1783 KB (0.49g 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 31 KB (vs 5086 KB first visit). 288 of 298 resources are served from browser cache, saving 1.40g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.41g)
First visit
5086 KB
Repeat visit
31 KB

99% reduction on repeat visits

Saving 1.40g CO2 per returning visitor

288 resources served from cache · 10 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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