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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
F
CO2 Per Page Load
Action
5.41g CO2 per view
FIX
5.41g CO2 per view
Critical::
5.41g CO2 per page view
This page transfers 19.1 MB, producing an estimated 5.41g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 1.00g, network 0.93g, end-user device 3.47g.
Got: 5.41g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 648.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 648.6 kg of CO2 annually — equivalent to charging 81079 smartphones.

5.41g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 19.1 MB

Your site
5.41g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
1.00g
Network
0.93g
End-user device
3.47g
At 10,000 monthly views: Monthly: 54.1 kg · Annual: 648.6 kg · ≈ 81079 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::
5.41g 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

5.41g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 801% more
vs Target 981% more
B
Web Font Weight Variants
6 font weights loaded across 1 famil(y/ies)
REVIEW
6 font weights loaded across 1 famil(y/ies)
Info::
6 font weights loaded -- review whether all are used
5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif.
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 141 KB (vs 19544 KB first visit). 123 of 126 resources are served from browser cache, saving 5.37g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 5.41g)
First visit
19544 KB
Repeat visit
141 KB

99% reduction on repeat visits

Saving 5.37g CO2 per returning visitor

123 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 23 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 23 KB (0% of page weight)

Unused JS 23 KB

0.01g unnecessary CO2 per visit

Actual transfer 19544 KB
Theoretical minimum 19521 KB
Potential savings 23 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
91 images, 36284 KB total, 44 KB wasted
INFO

Image Optimization Audit

Total Images

91

Total Size

36284 KB

Oversized

1

Wasted

44 KB

1 missing dimensions 89 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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