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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
60
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.43g CO2 per view
FIX
1.43g CO2 per view
Warning::
1.43g CO2 per page view
This page transfers 5.1 MB, producing an estimated 1.43g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.25g, end-user device 0.92g.
Got: 1.43g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 171.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 171.8 kg of CO2 annually — equivalent to charging 21469 smartphones.

1.43g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 27% of websites

Sustainable Web Design model v4 · Page size: 5.1 MB

Your site
1.43g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
0.25g
End-user device
0.92g
At 10,000 monthly views: Monthly: 14.3 kg · Annual: 171.8 kg · ≈ 21469 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
73th percentile
FIX
73th percentile
Warning::
1.43g 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

1.43g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 139% more
vs Target 186% more
C
Web Font Weight Variants
Action
15 font weights loaded across 9 famil(y/ies)
REVIEW
15 font weights loaded across 9 famil(y/ies)
Warning::
15 font weights loaded -- likely 100+ KB of unused payload
Loading 15 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Anton, Archivo, Fraunces, Inter, Montserrat, Oswald, Playfair Display, Roboto Slab, Space Grotesk.
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 37 KB (vs 5175 KB first visit). 29 of 30 resources are served from browser cache, saving 1.42g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.43g)
First visit
5175 KB
Repeat visit
37 KB

99% reduction on repeat visits

Saving 1.42g CO2 per returning visitor

29 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 5175 KB
Theoretical minimum 5175 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization
29 images, 4633 KB total, 3805 KB wasted
INFO

Image Optimization Audit

Total Images

29

Total Size

4633 KB

Oversized

3

Wasted

3805 KB

28 missing dimensions 1 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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