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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
77
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.04g CO2 per view
FIX
1.04g CO2 per view
Warning::
1.04g CO2 per page view
This page transfers 4.4 MB, producing an estimated 1.04g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.22g, end-user device 0.80g.
Got: 1.04g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 124.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 124.8 kg of CO2 annually — equivalent to charging 15603 smartphones.
Info::
Green hosting reduces data center emissions

1.04g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 38% of websites

Sustainable Web Design model v4 · Page size: 4.4 MB

Your site
1.04g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.22g
End-user device
0.80g
At 10,000 monthly views: Monthly: 10.4 kg · Annual: 124.8 kg · ≈ 15603 smartphone charges
D
Carbon Budget
Action
62th percentile
FIX
62th percentile
Warning::
1.04g CO2 — above the median website (0.60g)
Heavier than an estimated 38% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 62th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.04g

62nd percentile

Cleaner than 38% of websites

✗ Above the median website

vs Median 73% more
vs Target 108% more
B
Transfer Efficiency
84% efficient
REVIEW
84% efficient
Info::
Transfer efficiency: 84%
An estimated 726 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 726 KB of unused JavaScript. This wasted data produces 0.17g of unnecessary CO2 per page view.
84% efficient

Total waste: 726 KB (16% of page weight)

Unused JS 726 KB

0.17g unnecessary CO2 per visit

Actual transfer 4500 KB
Theoretical minimum 3774 KB
Potential savings 726 KB (0.17g 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
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Fastly CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Fastly: 100% renewable energy for edge network
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 Hosting✓ Green Hosted
Hosting Not identified✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 104 KB (vs 4500 KB first visit). 239 of 242 resources are served from browser cache, saving 1.02g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.04g)
First visit
4500 KB
Repeat visit
104 KB

98% reduction on repeat visits

Saving 1.02g CO2 per returning visitor

239 resources served from cache · 3 resources re-downloaded

A+
Web Font Weight Variants
2 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
2 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
2 font weight(s) loaded across 1 famil(y/ies)
Image Optimization
91 images, 2108 KB total, 8 KB wasted
INFO

Image Optimization Audit

Total Images

91

Total Size

2108 KB

Oversized

2

Wasted

8 KB

2 missing alt text 81 missing dimensions 51 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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