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Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
63
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
7
2 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.98g CO2 per view
FIX
1.98g CO2 per view
Warning::
1.98g CO2 per page view
This page transfers 7.0 MB, producing an estimated 1.98g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.37g, network 0.34g, end-user device 1.27g.
Got: 1.98g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 238.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 238.1 kg of CO2 annually — equivalent to charging 29766 smartphones.

1.98g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 11% of websites

Sustainable Web Design model v4 · Page size: 7.0 MB

Your site
1.98g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.37g
Network
0.34g
End-user device
1.27g
At 10,000 monthly views: Monthly: 19.8 kg · Annual: 238.1 kg · ≈ 29766 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 Shopify✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
89th percentile
FIX
89th percentile
Warning::
1.98g CO2 — above the median website (0.60g)
Heavier than an estimated 11% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 89th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.98g

89th percentile

Cleaner than 11% of websites

✗ Above the median website

vs Median 231% more
vs Target 297% more
B
Transfer Efficiency
90% efficient
REVIEW
90% efficient
Info::
Transfer efficiency: 90%
An estimated 749 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 749 KB of unused JavaScript. This wasted data produces 0.21g of unnecessary CO2 per page view.
90% efficient

Total waste: 749 KB (10% of page weight)

Unused JS 749 KB

0.21g unnecessary CO2 per visit

Actual transfer 7175 KB
Theoretical minimum 6425 KB
Potential savings 749 KB (0.21g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 242 KB (vs 7175 KB first visit). 622 of 635 resources are served from browser cache, saving 1.92g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 1.98g)
First visit
7175 KB
Repeat visit
242 KB

97% reduction on repeat visits

Saving 1.92g CO2 per returning visitor

622 resources served from cache · 13 resources re-downloaded

A+
Web Font Weight Variants
2 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
2 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
2 font weight(s) loaded across 1 famil(y/ies)
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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