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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
60
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
1.08g CO2 per view
FIX
1.08g CO2 per view
Warning::
1.08g CO2 per page view
This page transfers 3.8 MB, producing an estimated 1.08g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.20g, network 0.19g, end-user device 0.70g.
Got: 1.08g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 129.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 129.9 kg of CO2 annually — equivalent to charging 16241 smartphones.

1.08g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 37% of websites

Sustainable Web Design model v4 · Page size: 3.8 MB

Your site
1.08g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.20g
Network
0.19g
End-user device
0.70g
At 10,000 monthly views: Monthly: 10.8 kg · Annual: 129.9 kg · ≈ 16241 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 Not identified✗CDN Varnish✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
63th percentile
FIX
63th percentile
Warning::
1.08g CO2 — above the median website (0.60g)
Heavier than an estimated 37% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 63th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.08g

63rd percentile

Cleaner than 37% of websites

✗ Above the median website

vs Median 80% more
vs Target 117% 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
91% cached
PASS
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 358 KB (vs 3915 KB first visit). 94 of 96 resources are served from browser cache, saving 0.98g CO2 per repeat visit.
Info::
Repeat visit: 0.10g CO2 (first visit: 1.08g)
First visit
3915 KB
Repeat visit
358 KB

91% reduction on repeat visits

Saving 0.98g CO2 per returning visitor

94 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 282 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 282 KB (7% of page weight)

Unused JS 282 KB

0.08g unnecessary CO2 per visit

Actual transfer 3915 KB
Theoretical minimum 3632 KB
Potential savings 282 KB (0.08g 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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