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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
62
GRADE
D
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
1.51g CO2 per view
FIX
1.51g CO2 per view
Warning::
1.51g CO2 per page view
This page transfers 5.3 MB, producing an estimated 1.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.26g, end-user device 0.97g.
Got: 1.51g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 181.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 181.7 kg of CO2 annually — equivalent to charging 22711 smartphones.

1.51g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 24% of websites

Sustainable Web Design model v4 · Page size: 5.3 MB

Your site
1.51g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.28g
Network
0.26g
End-user device
0.97g
At 10,000 monthly views: Monthly: 15.1 kg · Annual: 181.7 kg · ≈ 22711 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
76th percentile
FIX
76th percentile
Warning::
1.51g CO2 — above the median website (0.60g)
Heavier than an estimated 24% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 76th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.51g

76th percentile

Cleaner than 24% of websites

✗ Above the median website

vs Median 152% more
vs Target 203% 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 64 KB (vs 5474 KB first visit). 173 of 175 resources are served from browser cache, saving 1.50g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.51g)
First visit
5474 KB
Repeat visit
64 KB

99% reduction on repeat visits

Saving 1.50g CO2 per returning visitor

173 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 358 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 358 KB (7% of page weight)

Unused JS 358 KB

0.10g unnecessary CO2 per visit

Actual transfer 5474 KB
Theoretical minimum 5115 KB
Potential savings 358 KB (0.10g 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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