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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
58
GRADE
D
FIX
4
REVIEW
1
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 1 REVIEW 4 FIX
D
CO2 Per Page Load
Action
0.91g CO2 per view
FIX
0.91g CO2 per view
Info::
0.91g CO2 per page view
This page transfers 3.2 MB, producing an estimated 0.91g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.17g, network 0.16g, end-user device 0.59g.
Got: 0.91g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 109.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 109.7 kg of CO2 annually — equivalent to charging 13706 smartphones.

0.91g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 42% of websites

Sustainable Web Design model v4 · Page size: 3.2 MB

Your site
0.91g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.17g
Network
0.16g
End-user device
0.59g
At 10,000 monthly views: Monthly: 9.1 kg · Annual: 109.7 kg · ≈ 13706 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

D
Carbon Budget
Action
58th percentile
FIX
58th percentile
Warning::
0.91g CO2 — above the median website (0.60g)
Heavier than an estimated 42% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 58th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.91g

58th percentile

Cleaner than 42% of websites

✗ Above the median website

vs Median 52% more
vs Target 83% more
D
Transfer Efficiency
Action
58% efficient
FIX
58% efficient
Warning::
Transfer efficiency: 58%
An estimated 1378 KB (42%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1378 KB of unused JavaScript. This wasted data produces 0.38g of unnecessary CO2 per page view.
58% efficient

Total waste: 1378 KB (42% of page weight)

Unused JS 1378 KB

0.38g unnecessary CO2 per visit

Actual transfer 3304 KB
Theoretical minimum 1925 KB
Potential savings 1378 KB (0.38g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 97 KB (vs 3304 KB first visit). 94 of 97 resources are served from browser cache, saving 0.89g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.91g)
First visit
3304 KB
Repeat visit
97 KB

97% reduction on repeat visits

Saving 0.89g CO2 per returning visitor

94 resources served from cache · 3 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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