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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
78
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 2 REVIEW 2 FIX
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

D
Carbon Budget
Action
51th percentile
FIX
51th percentile
Warning::
0.65g CO2 — above the median website (0.60g)
Heavier than an estimated 49% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 51th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.65g

51st percentile

Cleaner than 49% of websites

✗ Above the median website

vs Median 8% more
vs Target 30% more
B
CO2 Per Page Load
0.65g CO2 per view
REVIEW
0.65g CO2 per view
Info::
0.65g CO2 per page view
This page transfers 2.3 MB, producing an estimated 0.65g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.11g, end-user device 0.42g.
Got: 0.65g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 78.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 78.0 kg of CO2 annually — equivalent to charging 9744 smartphones.

0.65g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 49% of websites

Sustainable Web Design model v4 · Page size: 2.3 MB

Your site
0.65g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
0.11g
End-user device
0.42g
At 10,000 monthly views: Monthly: 6.5 kg · Annual: 78.0 kg · ≈ 9744 smartphone charges
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 55 KB (vs 2348 KB first visit). 75 of 76 resources are served from browser cache, saving 0.63g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.65g)
First visit
2348 KB
Repeat visit
55 KB

98% reduction on repeat visits

Saving 0.63g CO2 per returning visitor

75 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 74 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 74 KB (3% of page weight)

Unused JS 74 KB

0.02g unnecessary CO2 per visit

Actual transfer 2348 KB
Theoretical minimum 2274 KB
Potential savings 74 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Web Font Weight Variants
4 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
4 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
4 font weight(s) loaded across 1 famil(y/ies)
Image Optimization
45 images, 30 KB total, 28 KB wasted
INFO

Image Optimization Audit

Total Images

45

Total Size

30 KB

Oversized

17

Wasted

28 KB

14 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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