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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
78
GRADE
C
FIX
1
REVIEW
3
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 3 REVIEW 1 FIX
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

B
CO2 Per Page Load
0.63g CO2 per view
REVIEW
0.63g CO2 per view
Info::
0.63g CO2 per page view
This page transfers 2.2 MB, producing an estimated 0.63g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.11g, end-user device 0.40g.
Got: 0.63g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 75.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 75.2 kg of CO2 annually — equivalent to charging 9403 smartphones.

0.63g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 50% of websites

Sustainable Web Design model v4 · Page size: 2.2 MB

Your site
0.63g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
0.11g
End-user device
0.40g
At 10,000 monthly views: Monthly: 6.3 kg · Annual: 75.2 kg · ≈ 9403 smartphone charges
B
Carbon Budget
50th percentile
REVIEW
50th percentile
Warning::
0.63g CO2 — above the median website (0.60g)
Heavier than an estimated 50% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 50th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.63g

50th percentile

Cleaner than 50% of websites

✗ Above the median website

vs Median 4% more
vs Target 25% 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 171 KB (vs 2266 KB first visit). 46 of 49 resources are served from browser cache, saving 0.58g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.63g)
First visit
2266 KB
Repeat visit
171 KB

92% reduction on repeat visits

Saving 0.58g CO2 per returning visitor

46 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 50 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 50 KB (2% of page weight)

Unused JS 50 KB

0.01g unnecessary CO2 per visit

Actual transfer 2266 KB
Theoretical minimum 2216 KB
Potential savings 50 KB (0.01g 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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