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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
66
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.26g CO2 per view
FIX
1.26g CO2 per view
Warning::
1.26g CO2 per page view
This page transfers 4.5 MB, producing an estimated 1.26g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.23g, network 0.22g, end-user device 0.81g.
Got: 1.26g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 151.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 151.6 kg of CO2 annually — equivalent to charging 18948 smartphones.

1.26g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 32% of websites

Sustainable Web Design model v4 · Page size: 4.5 MB

Your site
1.26g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.23g
Network
0.22g
End-user device
0.81g
At 10,000 monthly views: Monthly: 12.6 kg · Annual: 151.6 kg · ≈ 18948 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
68th percentile
FIX
68th percentile
Warning::
1.26g CO2 — above the median website (0.60g)
Heavier than an estimated 32% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 68th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.26g

68th percentile

Cleaner than 32% of websites

✗ Above the median website

vs Median 111% more
vs Target 153% more
B
Transfer Efficiency
76% efficient
REVIEW
76% efficient
Info::
Transfer efficiency: 76%
An estimated 1091 KB (24%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1091 KB of unused JavaScript. This wasted data produces 0.30g of unnecessary CO2 per page view.
76% efficient

Total waste: 1091 KB (24% of page weight)

Unused JS 1091 KB

0.30g unnecessary CO2 per visit

Actual transfer 4567 KB
Theoretical minimum 3475 KB
Potential savings 1091 KB (0.30g 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 45 KB (vs 4567 KB first visit). 158 of 161 resources are served from browser cache, saving 1.25g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.26g)
First visit
4567 KB
Repeat visit
45 KB

99% reduction on repeat visits

Saving 1.25g CO2 per returning visitor

158 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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