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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
70
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
1.08g CO2 per view
FIX
1.08g CO2 per view
Warning::
1.08g CO2 per page view
This page transfers 3.8 MB, producing an estimated 1.08g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.20g, network 0.19g, end-user device 0.70g.
Got: 1.08g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 129.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 129.9 kg of CO2 annually — equivalent to charging 16239 smartphones.

1.08g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 37% of websites

Sustainable Web Design model v4 · Page size: 3.8 MB

Your site
1.08g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.20g
Network
0.19g
End-user device
0.70g
At 10,000 monthly views: Monthly: 10.8 kg · Annual: 129.9 kg · ≈ 16239 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
63th percentile
FIX
63th percentile
Warning::
1.08g CO2 — above the median website (0.60g)
Heavier than an estimated 37% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 63th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.08g

63rd percentile

Cleaner than 37% of websites

✗ Above the median website

vs Median 80% more
vs Target 117% 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
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 314 KB (vs 3914 KB first visit). 299 of 300 resources are served from browser cache, saving 1.00g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 1.08g)
First visit
3914 KB
Repeat visit
314 KB

92% reduction on repeat visits

Saving 1.00g CO2 per returning visitor

299 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 212 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 212 KB (5% of page weight)

Unused JS 212 KB

0.06g unnecessary CO2 per visit

Actual transfer 3914 KB
Theoretical minimum 3702 KB
Potential savings 212 KB (0.06g 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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