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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
68
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.89g CO2 per view
FIX
1.89g CO2 per view
Warning::
1.89g CO2 per page view
This page transfers 8.0 MB, producing an estimated 1.89g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.39g, end-user device 1.45g.
Got: 1.89g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 226.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 226.5 kg of CO2 annually — equivalent to charging 28316 smartphones.
Info::
Green hosting reduces data center emissions

1.89g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 14% of websites

Sustainable Web Design model v4 · Page size: 8.0 MB

Your site
1.89g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.39g
End-user device
1.45g
At 10,000 monthly views: Monthly: 18.9 kg · Annual: 226.5 kg · ≈ 28316 smartphone charges
F
Carbon Budget
Action
86th percentile
FIX
86th percentile
Warning::
1.89g CO2 — above the median website (0.60g)
Heavier than an estimated 14% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 86th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.89g

86th percentile

Cleaner than 14% of websites

✗ Above the median website

vs Median 215% more
vs Target 278% more
B
Transfer Efficiency
85% efficient
REVIEW
85% efficient
Info::
Transfer efficiency: 85%
An estimated 1249 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1249 KB of unused JavaScript. This wasted data produces 0.29g of unnecessary CO2 per page view.
85% efficient

Total waste: 1249 KB (15% of page weight)

Unused JS 1249 KB

0.29g unnecessary CO2 per visit

Actual transfer 8167 KB
Theoretical minimum 6917 KB
Potential savings 1249 KB (0.29g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Cloudflare✓CDN Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 45 KB (vs 8167 KB first visit). 137 of 142 resources are served from browser cache, saving 1.88g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.89g)
First visit
8167 KB
Repeat visit
45 KB

99% reduction on repeat visits

Saving 1.88g CO2 per returning visitor

137 resources served from cache · 5 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: Cloudflare

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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