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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
96
GRADE
A
FIX
0
REVIEW
1
PASS
5
INFO
0
Device:
Mobile Desktop
Checks
6
5 PASS 1 REVIEW
B
Transfer Efficiency
85% efficient
REVIEW
85% efficient
Info::
Transfer efficiency: 85%
An estimated 21 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 21 KB of unused JavaScript. This wasted data produces 0.01g of unnecessary CO2 per page view.
85% efficient

Total waste: 21 KB (15% of page weight)

Unused JS 21 KB

0.01g unnecessary CO2 per visit

Actual transfer 151 KB
Theoretical minimum 129 KB
Potential savings 21 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

A+
CO2 Per Page Load
0.03g CO2 per view
PASS
0.03g CO2 per view
Info::
0.03g CO2 per page view
This page transfers 0.1 MB, producing an estimated 0.03g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.01g, end-user device 0.03g.
Got: 0.03g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 4.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 4.2 kg of CO2 annually — equivalent to charging 524 smartphones.
Info::
Green hosting reduces data center emissions

0.03g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.1 MB

Your site
0.03g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.00g
Network
0.01g
End-user device
0.03g
At 10,000 monthly views: Monthly: 0.3 kg · Annual: 4.2 kg · ≈ 524 smartphone charges
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 6 KB (vs 151 KB first visit). 25 of 26 resources are served from browser cache, saving 0.03g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.03g)
First visit
151 KB
Repeat visit
6 KB

95% reduction on repeat visits

Saving 0.03g CO2 per returning visitor

25 resources served from cache · 1 resources re-downloaded

A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.03g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.03g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 94% cleaner ✓
vs Target 93% cleaner ✓
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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