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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
71
GRADE
C
FIX
3
REVIEW
1
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 1 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.44g CO2 per view
FIX
1.44g CO2 per view
Warning::
1.44g CO2 per page view
This page transfers 5.1 MB, producing an estimated 1.44g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.25g, end-user device 0.93g.
Got: 1.44g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 173.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 173.3 kg of CO2 annually — equivalent to charging 21660 smartphones.

1.44g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 26% of websites

Sustainable Web Design model v4 · Page size: 5.1 MB

Your site
1.44g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
0.25g
End-user device
0.93g
At 10,000 monthly views: Monthly: 14.4 kg · Annual: 173.3 kg · ≈ 21660 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
74th percentile
FIX
74th percentile
Warning::
1.44g CO2 — above the median website (0.60g)
Heavier than an estimated 26% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 74th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.44g

74th percentile

Cleaner than 26% of websites

✗ Above the median website

vs Median 141% more
vs Target 189% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 21 KB (vs 5221 KB first visit). 85 of 86 resources are served from browser cache, saving 1.44g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.44g)
First visit
5221 KB
Repeat visit
21 KB

100% reduction on repeat visits

Saving 1.44g CO2 per returning visitor

85 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 281 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 281 KB (5% of page weight)

Unused JS 281 KB

0.08g unnecessary CO2 per visit

Actual transfer 5221 KB
Theoretical minimum 4940 KB
Potential savings 281 KB (0.08g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Web Font Weight Variants
3 font weights loaded across 2 famil(y/ies) -- reasonable
PASS
3 font weights loaded across 2 famil(y/ies) -- reasonable
Info::
3 font weight(s) loaded across 2 famil(y/ies)
Image Optimization
51 images, 1854 KB total, 918 KB wasted
INFO

Image Optimization Audit

Total Images

51

Total Size

1854 KB

Oversized

17

Wasted

918 KB

49 missing dimensions 25 missing lazy loading
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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