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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
51
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.59g CO2 per view
FIX
2.59g CO2 per view
Critical::
2.59g CO2 per page view
This page transfers 9.1 MB, producing an estimated 2.59g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.48g, network 0.45g, end-user device 1.66g.
Got: 2.59g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 310.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 310.5 kg of CO2 annually — equivalent to charging 38812 smartphones.

2.59g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 9.1 MB

Your site
2.59g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.48g
Network
0.45g
End-user device
1.66g
At 10,000 monthly views: Monthly: 25.9 kg · Annual: 310.5 kg · ≈ 38812 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::
2.59g 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

2.59g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 331% more
vs Target 417% more
C
Transfer Efficiency
Action
68% efficient
REVIEW
68% efficient
Warning::
Transfer efficiency: 68%
An estimated 3031 KB (32%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 3031 KB of unused JavaScript. This wasted data produces 0.84g of unnecessary CO2 per page view.
68% efficient

Total waste: 3031 KB (32% of page weight)

Unused JS 3031 KB

0.84g unnecessary CO2 per visit

Actual transfer 9355 KB
Theoretical minimum 6324 KB
Potential savings 3031 KB (0.84g CO2)

See Deep Analysis sections above for specific optimizations.

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 63 KB (vs 9355 KB first visit). 218 of 222 resources are served from browser cache, saving 2.57g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.59g)
First visit
9355 KB
Repeat visit
63 KB

99% reduction on repeat visits

Saving 2.57g CO2 per returning visitor

218 resources served from cache · 4 resources re-downloaded

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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