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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
3.23g CO2 per view
FIX
3.23g CO2 per view
Critical::
3.23g CO2 per page view
This page transfers 11.4 MB, producing an estimated 3.23g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.60g, network 0.56g, end-user device 2.07g.
Got: 3.23g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 387.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 387.6 kg of CO2 annually — equivalent to charging 48451 smartphones.

3.23g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 11.4 MB

Your site
3.23g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.60g
Network
0.56g
End-user device
2.07g
At 10,000 monthly views: Monthly: 32.3 kg · Annual: 387.6 kg · ≈ 48451 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::
3.23g 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

3.23g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 438% more
vs Target 546% 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 114 KB (vs 11679 KB first visit). 567 of 570 resources are served from browser cache, saving 3.20g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 3.23g)
First visit
11679 KB
Repeat visit
114 KB

99% reduction on repeat visits

Saving 3.20g CO2 per returning visitor

567 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 741 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 741 KB (6% of page weight)

Unused JS 741 KB

0.21g unnecessary CO2 per visit

Actual transfer 11679 KB
Theoretical minimum 10938 KB
Potential savings 741 KB (0.21g 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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