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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
F
CO2 Per Page Load
Action
1.86g CO2 per view
FIX
1.86g CO2 per view
Warning::
1.86g CO2 per page view
This page transfers 6.6 MB, producing an estimated 1.86g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.34g, network 0.32g, end-user device 1.20g.
Got: 1.86g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 223.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 223.4 kg of CO2 annually — equivalent to charging 27925 smartphones.

1.86g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 14% of websites

Sustainable Web Design model v4 · Page size: 6.6 MB

Your site
1.86g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.34g
Network
0.32g
End-user device
1.20g
At 10,000 monthly views: Monthly: 18.6 kg · Annual: 223.4 kg · ≈ 27925 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
86th percentile
FIX
86th percentile
Warning::
1.86g CO2 — above the median website (0.60g)
Heavier than an estimated 14% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 86th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.86g

86th percentile

Cleaner than 14% of websites

✗ Above the median website

vs Median 210% more
vs Target 272% 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 123 KB (vs 6731 KB first visit). 53 of 55 resources are served from browser cache, saving 1.83g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.86g)
First visit
6731 KB
Repeat visit
123 KB

98% reduction on repeat visits

Saving 1.83g CO2 per returning visitor

53 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 444 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 444 KB (7% of page weight)

Unused JS 444 KB

0.12g unnecessary CO2 per visit

Actual transfer 6731 KB
Theoretical minimum 6287 KB
Potential savings 444 KB (0.12g 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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