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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
90
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 228 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 228 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.
85% efficient

Total waste: 228 KB (15% of page weight)

Unused JS 228 KB

0.05g unnecessary CO2 per visit

Actual transfer 1489 KB
Theoretical minimum 1260 KB
Potential savings 228 KB (0.05g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.34g CO2 per view
PASS
0.34g CO2 per view
Info::
0.34g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.34g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.26g.
Got: 0.34g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 41.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 41.3 kg of CO2 annually — equivalent to charging 5163 smartphones.
Info::
Green hosting reduces data center emissions

0.34g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 76% of websites

Sustainable Web Design model v4 · Page size: 1.5 MB

Your site
0.34g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.07g
End-user device
0.26g
At 10,000 monthly views: Monthly: 3.4 kg · Annual: 41.3 kg · ≈ 5163 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Pantheon, CDN: Cloudflare
Info::
Pantheon: 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 Pantheon✓CDN Cloudflare✓

Pantheon: 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 16 KB (vs 1489 KB first visit). 149 of 151 resources are served from browser cache, saving 0.34g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.34g)
First visit
1489 KB
Repeat visit
16 KB

99% reduction on repeat visits

Saving 0.34g CO2 per returning visitor

149 resources served from cache · 2 resources re-downloaded

A
Carbon Budget
24th percentile
PASS
24th percentile
Info::
0.34g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 76% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 24th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.34g

24th percentile

Cleaner than 76% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 43% cleaner ✓
vs Target 31% 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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