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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
70
GRADE
C
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
D
CO2 Per Page Load
Action
0.84g CO2 per view
FIX
0.84g CO2 per view
Info::
0.84g CO2 per page view
This page transfers 3.0 MB, producing an estimated 0.84g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.16g, network 0.15g, end-user device 0.54g.
Got: 0.84g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 101.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 101.1 kg of CO2 annually — equivalent to charging 12639 smartphones.

0.84g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 44% of websites

Sustainable Web Design model v4 · Page size: 3.0 MB

Your site
0.84g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.16g
Network
0.15g
End-user device
0.54g
At 10,000 monthly views: Monthly: 8.4 kg · Annual: 101.1 kg · ≈ 12639 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
56th percentile
FIX
56th percentile
Warning::
0.84g CO2 — above the median website (0.60g)
Heavier than an estimated 44% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 56th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.84g

56th percentile

Cleaner than 44% of websites

✗ Above the median website

vs Median 40% more
vs Target 69% 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
93% cached
PASS
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 223 KB (vs 3046 KB first visit). 284 of 292 resources are served from browser cache, saving 0.78g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 0.84g)
First visit
3046 KB
Repeat visit
223 KB

93% reduction on repeat visits

Saving 0.78g CO2 per returning visitor

284 resources served from cache · 8 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 267 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 267 KB (9% of page weight)

Unused JS 267 KB

0.07g unnecessary CO2 per visit

Actual transfer 3046 KB
Theoretical minimum 2779 KB
Potential savings 267 KB (0.07g 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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