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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
74
GRADE
C
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.30g CO2 per view
FIX
1.30g CO2 per view
Warning::
1.30g CO2 per page view
This page transfers 4.6 MB, producing an estimated 1.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.24g, network 0.23g, end-user device 0.84g.
Got: 1.30g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 156.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 156.5 kg of CO2 annually — equivalent to charging 19561 smartphones.

1.30g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 30% of websites

Sustainable Web Design model v4 · Page size: 4.6 MB

Your site
1.30g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.24g
Network
0.23g
End-user device
0.84g
At 10,000 monthly views: Monthly: 13.0 kg · Annual: 156.5 kg · ≈ 19561 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

D
Carbon Budget
Action
70th percentile
FIX
70th percentile
Warning::
1.30g CO2 — above the median website (0.60g)
Heavier than an estimated 30% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 70th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.30g

70th percentile

Cleaner than 30% of websites

✗ Above the median website

vs Median 117% more
vs Target 161% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
93% cached
PASS
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 313 KB (vs 4715 KB first visit). 233 of 234 resources are served from browser cache, saving 1.22g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 1.30g)
First visit
4715 KB
Repeat visit
313 KB

93% reduction on repeat visits

Saving 1.22g CO2 per returning visitor

233 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
90% efficient
PASS
90% efficient
Info::
Transfer efficiency: 90%
Only 453 KB of potential savings identified. Your page is well-optimized for size.
90% efficient

Total waste: 453 KB (10% of page weight)

Unused JS 453 KB

0.13g unnecessary CO2 per visit

Actual transfer 4715 KB
Theoretical minimum 4261 KB
Potential savings 453 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

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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