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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
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
4.80g CO2 per view
FIX
4.80g CO2 per view
Critical::
4.80g CO2 per page view
This page transfers 16.9 MB, producing an estimated 4.80g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.89g, network 0.83g, end-user device 3.08g.
Got: 4.80g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 575.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 575.7 kg of CO2 annually — equivalent to charging 71962 smartphones.

4.80g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 16.9 MB

Your site
4.80g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.89g
Network
0.83g
End-user device
3.08g
At 10,000 monthly views: Monthly: 48.0 kg · Annual: 575.7 kg · ≈ 71962 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::
4.80g 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

4.80g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 700% more
vs Target 860% more
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 88 KB (vs 17347 KB first visit). 321 of 329 resources are served from browser cache, saving 4.77g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 4.80g)
First visit
17347 KB
Repeat visit
88 KB

99% reduction on repeat visits

Saving 4.77g CO2 per returning visitor

321 resources served from cache · 8 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 1387 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 1387 KB (8% of page weight)

Unused JS 1387 KB

0.38g unnecessary CO2 per visit

Actual transfer 17347 KB
Theoretical minimum 15959 KB
Potential savings 1387 KB (0.38g CO2)

See Deep Analysis sections above for specific optimizations.

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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