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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
F
CO2 Per Page Load
Action
2.01g CO2 per view
FIX
2.01g CO2 per view
Critical::
2.01g CO2 per page view
This page transfers 8.5 MB, producing an estimated 2.01g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.41g, end-user device 1.54g.
Got: 2.01g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 240.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 240.8 kg of CO2 annually — equivalent to charging 30100 smartphones.
Info::
Green hosting reduces data center emissions

2.01g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.5 MB

Your site
2.01g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.41g
End-user device
1.54g
At 10,000 monthly views: Monthly: 20.1 kg · Annual: 240.8 kg · ≈ 30100 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.01g 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

2.01g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 234% more
vs Target 301% 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
88% efficient
REVIEW
88% efficient
Info::
Transfer efficiency: 88%
An estimated 1074 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1074 KB of unused JavaScript. This wasted data produces 0.25g of unnecessary CO2 per page view.
88% efficient

Total waste: 1074 KB (12% of page weight)

Unused JS 1074 KB

0.25g unnecessary CO2 per visit

Actual transfer 8681 KB
Theoretical minimum 7607 KB
Potential savings 1074 KB (0.25g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 665 KB (vs 8681 KB first visit). 196 of 198 resources are served from browser cache, saving 1.85g CO2 per repeat visit.
Info::
Repeat visit: 0.15g CO2 (first visit: 2.01g)
First visit
8681 KB
Repeat visit
665 KB

92% reduction on repeat visits

Saving 1.85g CO2 per returning visitor

196 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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