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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
72
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.44g CO2 per view
FIX
1.44g CO2 per view
Warning::
1.44g CO2 per page view
This page transfers 6.1 MB, producing an estimated 1.44g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.30g, end-user device 1.10g.
Got: 1.44g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 172.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 172.6 kg of CO2 annually — equivalent to charging 21568 smartphones.
Info::
Green hosting reduces data center emissions

1.44g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 27% of websites

Sustainable Web Design model v4 · Page size: 6.1 MB

Your site
1.44g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.30g
End-user device
1.10g
At 10,000 monthly views: Monthly: 14.4 kg · Annual: 172.6 kg · ≈ 21568 smartphone charges
F
Carbon Budget
Action
73th percentile
FIX
73th percentile
Warning::
1.44g CO2 — above the median website (0.60g)
Heavier than an estimated 27% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 73th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.44g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 140% more
vs Target 188% more
B
Transfer Efficiency
88% efficient
REVIEW
88% efficient
Info::
Transfer efficiency: 88%
An estimated 749 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 749 KB of unused JavaScript. This wasted data produces 0.17g of unnecessary CO2 per page view.
88% efficient

Total waste: 749 KB (12% of page weight)

Unused JS 749 KB

0.17g unnecessary CO2 per visit

Actual transfer 6220 KB
Theoretical minimum 5471 KB
Potential savings 749 KB (0.17g 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
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 302 KB (vs 6220 KB first visit). 98 of 102 resources are served from browser cache, saving 1.37g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 1.44g)
First visit
6220 KB
Repeat visit
302 KB

95% reduction on repeat visits

Saving 1.37g CO2 per returning visitor

98 resources served from cache · 4 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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