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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
65
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
2.85g CO2 per view
FIX
2.85g CO2 per view
Critical::
2.85g CO2 per page view
This page transfers 10.1 MB, producing an estimated 2.85g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.53g, network 0.49g, end-user device 1.83g.
Got: 2.85g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 342.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 342.0 kg of CO2 annually — equivalent to charging 42754 smartphones.

2.85g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.1 MB

Your site
2.85g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.53g
Network
0.49g
End-user device
1.83g
At 10,000 monthly views: Monthly: 28.5 kg · Annual: 342.0 kg · ≈ 42754 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::
2.85g 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

2.85g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 375% more
vs Target 470% 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 8 KB (vs 10306 KB first visit). 90 of 91 resources are served from browser cache, saving 2.85g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 2.85g)
First visit
10306 KB
Repeat visit
8 KB

100% reduction on repeat visits

Saving 2.85g CO2 per returning visitor

90 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 111 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 111 KB (1% of page weight)

Unused JS 111 KB

0.03g unnecessary CO2 per visit

Actual transfer 10306 KB
Theoretical minimum 10194 KB
Potential savings 111 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Web Font Weight Variants
3 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
3 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
3 font weight(s) loaded across 1 famil(y/ies)
Image Optimization
11 images, 7573 KB total, 6840 KB wasted
INFO

Image Optimization Audit

Total Images

11

Total Size

7573 KB

Oversized

4

Wasted

6840 KB

11 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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