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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
63
GRADE
D
FIX
3
REVIEW
1
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
3.13g CO2 per view
FIX
3.13g CO2 per view
Critical::
3.13g CO2 per page view
This page transfers 11.1 MB, producing an estimated 3.13g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.58g, network 0.54g, end-user device 2.01g.
Got: 3.13g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 375.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 375.5 kg of CO2 annually — equivalent to charging 46941 smartphones.

3.13g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 11.1 MB

Your site
3.13g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.58g
Network
0.54g
End-user device
2.01g
At 10,000 monthly views: Monthly: 31.3 kg · Annual: 375.5 kg · ≈ 46941 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::
3.13g 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

3.13g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 422% more
vs Target 526% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 35 KB (vs 11315 KB first visit). 125 of 128 resources are served from browser cache, saving 3.12g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 3.13g)
First visit
11315 KB
Repeat visit
35 KB

100% reduction on repeat visits

Saving 3.12g CO2 per returning visitor

125 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 202 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 202 KB (2% of page weight)

Unused JS 202 KB

0.06g unnecessary CO2 per visit

Actual transfer 11315 KB
Theoretical minimum 11112 KB
Potential savings 202 KB (0.06g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Web Font Weight Variants
4 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
4 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
4 font weight(s) loaded across 1 famil(y/ies)
Image Optimization
25 images, 905 KB total, 270 KB wasted
INFO

Image Optimization Audit

Total Images

25

Total Size

905 KB

Oversized

12

Wasted

270 KB

10 missing alt text 23 missing dimensions 10 missing lazy loading
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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