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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
61
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.26g CO2 per view
FIX
1.26g CO2 per view
Warning::
1.26g CO2 per page view
This page transfers 5.3 MB, producing an estimated 1.26g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.26g, end-user device 0.97g.
Got: 1.26g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 151.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 151.2 kg of CO2 annually — equivalent to charging 18898 smartphones.
Info::
Green hosting reduces data center emissions

1.26g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 32% of websites

Sustainable Web Design model v4 · Page size: 5.3 MB

Your site
1.26g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.26g
End-user device
0.97g
At 10,000 monthly views: Monthly: 12.6 kg · Annual: 151.2 kg · ≈ 18898 smartphone charges
D
Carbon Budget
Action
68th percentile
FIX
68th percentile
Warning::
1.26g CO2 — above the median website (0.60g)
Heavier than an estimated 32% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 68th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.26g

68th percentile

Cleaner than 32% of websites

✗ Above the median website

vs Median 110% more
vs Target 152% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
AWS uses renewable energy
Info::
AWS: Verified by the Green Web Foundation
Info::
AWS CloudFront: Renewable varies by edge location
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 AWS✓CDN AWS CloudFront✗

AWS: Verified by the Green Web Foundation

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Transfer Efficiency
82% efficient
REVIEW
82% efficient
Info::
Transfer efficiency: 82%
An estimated 1000 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1000 KB of unused JavaScript. This wasted data produces 0.23g of unnecessary CO2 per page view.
82% efficient

Total waste: 1000 KB (18% of page weight)

Unused JS 1000 KB

0.23g unnecessary CO2 per visit

Actual transfer 5450 KB
Theoretical minimum 4450 KB
Potential savings 1000 KB (0.23g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
87% cached
PASS
87% cached
Info::
87% reduction on repeat visits
Returning visitors download only 686 KB (vs 5450 KB first visit). 197 of 199 resources are served from browser cache, saving 1.10g CO2 per repeat visit.
Info::
Repeat visit: 0.16g CO2 (first visit: 1.26g)
First visit
5450 KB
Repeat visit
686 KB

87% reduction on repeat visits

Saving 1.10g CO2 per returning visitor

197 resources served from cache · 2 resources re-downloaded

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

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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