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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
82
GRADE
B
FIX
1
REVIEW
0
PASS
5
INFO
0
Device:
Mobile Desktop
Checks
6
5 PASS 1 FIX
D
Transfer Efficiency
Action
53% efficient
FIX
53% efficient
Warning::
Transfer efficiency: 53%
An estimated 653 KB (47%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 653 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
53% efficient

Total waste: 653 KB (47% of page weight)

Unused JS 653 KB

0.15g unnecessary CO2 per visit

Actual transfer 1384 KB
Theoretical minimum 730 KB
Potential savings 653 KB (0.15g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.32g CO2 per view
PASS
0.32g CO2 per view
Info::
0.32g CO2 per page view
This page transfers 1.4 MB, producing an estimated 0.32g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.25g.
Got: 0.32g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 38.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 38.4 kg of CO2 annually — equivalent to charging 4798 smartphones.
Info::
Green hosting reduces data center emissions

0.32g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 79% of websites

Sustainable Web Design model v4 · Page size: 1.4 MB

Your site
0.32g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.07g
End-user device
0.25g
At 10,000 monthly views: Monthly: 3.2 kg · Annual: 38.4 kg · ≈ 4798 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Amazon Web Services, CDN: Cloudflare
Info::
Amazon Web Services: 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 Amazon Web Services✓CDN Cloudflare✓

Amazon Web Services: 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 4 KB (vs 1384 KB first visit). 82 of 83 resources are served from browser cache, saving 0.32g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.32g)
First visit
1384 KB
Repeat visit
4 KB

100% reduction on repeat visits

Saving 0.32g CO2 per returning visitor

82 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
21th percentile
PASS
21th percentile
Info::
0.32g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 79% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 21th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.32g

21st percentile

Cleaner than 79% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 47% cleaner ✓
vs Target 36% 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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