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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
80
GRADE
B
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
D
CO2 Per Page Load
Action
1.20g CO2 per view
FIX
1.20g CO2 per view
Warning::
1.20g CO2 per page view
This page transfers 5.1 MB, producing an estimated 1.20g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.25g, end-user device 0.92g.
Got: 1.20g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 143.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 143.8 kg of CO2 annually — equivalent to charging 17977 smartphones.
Info::
Green hosting reduces data center emissions

1.20g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 33% of websites

Sustainable Web Design model v4 · Page size: 5.1 MB

Your site
1.20g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.25g
End-user device
0.92g
At 10,000 monthly views: Monthly: 12.0 kg · Annual: 143.8 kg · ≈ 17977 smartphone charges
D
Carbon Budget
Action
67th percentile
FIX
67th percentile
Warning::
1.20g CO2 — above the median website (0.60g)
Heavier than an estimated 33% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 67th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.20g

67th percentile

Cleaner than 33% of websites

✗ Above the median website

vs Median 100% more
vs Target 140% more
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
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 198 KB (vs 5185 KB first visit). 166 of 175 resources are served from browser cache, saving 1.15g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 1.20g)
First visit
5185 KB
Repeat visit
198 KB

96% reduction on repeat visits

Saving 1.15g CO2 per returning visitor

166 resources served from cache · 9 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 20 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 20 KB (0% of page weight)

Unused JS 20 KB

0.00g unnecessary CO2 per visit

Actual transfer 5185 KB
Theoretical minimum 5164 KB
Potential savings 20 KB (0.00g CO2)

See Deep Analysis sections above for specific optimizations.

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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