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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
56
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
4.51g CO2 per view
FIX
4.51g CO2 per view
Critical::
4.51g CO2 per page view
This page transfers 15.9 MB, producing an estimated 4.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.83g, network 0.78g, end-user device 2.89g.
Got: 4.51g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 541.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 541.0 kg of CO2 annually — equivalent to charging 67625 smartphones.

4.51g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 15.9 MB

Your site
4.51g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.83g
Network
0.78g
End-user device
2.89g
At 10,000 monthly views: Monthly: 45.1 kg · Annual: 541.0 kg · ≈ 67625 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
95th percentile
FIX
95th percentile
Warning::
4.51g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

4.51g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 651% more
vs Target 802% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 8 KB (vs 16301 KB first visit). 167 of 168 resources are served from browser cache, saving 4.51g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 4.51g)
First visit
16301 KB
Repeat visit
8 KB

100% reduction on repeat visits

Saving 4.51g CO2 per returning visitor

167 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 138 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 138 KB (1% of page weight)

Unused JS 138 KB

0.04g unnecessary CO2 per visit

Actual transfer 16301 KB
Theoretical minimum 16162 KB
Potential savings 138 KB (0.04g 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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