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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
59
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
2.97g CO2 per view
FIX
2.97g CO2 per view
Critical::
2.97g CO2 per page view
This page transfers 10.5 MB, producing an estimated 2.97g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.55g, network 0.51g, end-user device 1.91g.
Got: 2.97g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 356.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 356.4 kg of CO2 annually — equivalent to charging 44555 smartphones.

2.97g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.5 MB

Your site
2.97g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.55g
Network
0.51g
End-user device
1.91g
At 10,000 monthly views: Monthly: 29.7 kg · Annual: 356.4 kg · ≈ 44555 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::
2.97g 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

2.97g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 395% more
vs Target 494% 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 100 KB (vs 10740 KB first visit). 158 of 161 resources are served from browser cache, saving 2.94g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 2.97g)
First visit
10740 KB
Repeat visit
100 KB

99% reduction on repeat visits

Saving 2.94g CO2 per returning visitor

158 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 891 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 891 KB (8% of page weight)

Unused JS 891 KB

0.25g unnecessary CO2 per visit

Actual transfer 10740 KB
Theoretical minimum 9848 KB
Potential savings 891 KB (0.25g 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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