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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
4.40g CO2 per view
FIX
4.40g CO2 per view
Critical::
4.40g CO2 per page view
This page transfers 15.5 MB, producing an estimated 4.40g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.82g, network 0.76g, end-user device 2.83g.
Got: 4.40g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 528.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 528.2 kg of CO2 annually — equivalent to charging 66029 smartphones.

4.40g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 15.5 MB

Your site
4.40g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.82g
Network
0.76g
End-user device
2.83g
At 10,000 monthly views: Monthly: 44.0 kg · Annual: 528.2 kg · ≈ 66029 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::
4.40g 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

4.40g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 634% more
vs Target 780% 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 130 KB (vs 15916 KB first visit). 325 of 331 resources are served from browser cache, saving 4.37g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 4.40g)
First visit
15916 KB
Repeat visit
130 KB

99% reduction on repeat visits

Saving 4.37g CO2 per returning visitor

325 resources served from cache · 6 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 1354 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 1354 KB (9% of page weight)

Unused JS 1354 KB

0.37g unnecessary CO2 per visit

Actual transfer 15916 KB
Theoretical minimum 14562 KB
Potential savings 1354 KB (0.37g 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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