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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
58
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Device:
Mobile Desktop
Checks
8
1 PASS 3 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.25g CO2 per view
FIX
2.25g CO2 per view
Critical::
2.25g CO2 per page view
This page transfers 7.9 MB, producing an estimated 2.25g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.42g, network 0.39g, end-user device 1.44g.
Got: 2.25g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 269.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 269.7 kg of CO2 annually — equivalent to charging 33707 smartphones.

2.25g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 7.9 MB

Your site
2.25g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.42g
Network
0.39g
End-user device
1.44g
At 10,000 monthly views: Monthly: 22.5 kg · Annual: 269.7 kg · ≈ 33707 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
95th percentile
FIX
95th percentile
Warning::
2.25g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.25g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 275% more
vs Target 349% more
C
Transfer Efficiency
Action
75% efficient
REVIEW
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 2063 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2063 KB of unused JavaScript. This wasted data produces 0.57g of unnecessary CO2 per page view.
75% efficient

Total waste: 2063 KB (25% of page weight)

Unused JS 2063 KB

0.57g unnecessary CO2 per visit

Actual transfer 8125 KB
Theoretical minimum 6061 KB
Potential savings 2063 KB (0.57g CO2)

See Deep Analysis sections above for specific optimizations.

C
Web Font Weight Variants
Action
23 font weights loaded across 1 famil(y/ies)
REVIEW
23 font weights loaded across 1 famil(y/ies)
Warning::
23 font weights loaded -- likely 100+ KB of unused payload
Loading 23 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: Archivo.
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 76 KB (vs 8125 KB first visit). 227 of 236 resources are served from browser cache, saving 2.23g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.25g)
First visit
8125 KB
Repeat visit
76 KB

99% reduction on repeat visits

Saving 2.23g CO2 per returning visitor

227 resources served from cache · 9 resources re-downloaded

Image Optimization
199 images, 2 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

199

Total Size

2 KB

Oversized

55

198 missing dimensions 63 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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