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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
94
GRADE
A
FIX
0
REVIEW
0
PASS
6
INFO
0
Device:
Mobile Desktop
Checks
6
6 PASS
A
CO2 Per Page Load
0.30g CO2 per view
PASS
0.30g CO2 per view
Info::
0.30g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.23g.
Got: 0.30g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 35.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 35.6 kg of CO2 annually — equivalent to charging 4454 smartphones.
Info::
Green hosting reduces data center emissions

0.30g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 81% of websites

Sustainable Web Design model v4 · Page size: 1.3 MB

Your site
0.30g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.06g
End-user device
0.23g
At 10,000 monthly views: Monthly: 3.0 kg · Annual: 35.6 kg · ≈ 4454 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Cloudflare
Info::
Next.js: 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 Next.js✓CDN Cloudflare✓

Next.js: 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 46 KB (vs 1284 KB first visit). 110 of 111 resources are served from browser cache, saving 0.29g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.30g)
First visit
1284 KB
Repeat visit
46 KB

96% reduction on repeat visits

Saving 0.29g CO2 per returning visitor

110 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
19th percentile
PASS
19th percentile
Info::
0.30g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 81% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 19th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.30g

19th percentile

Cleaner than 81% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 51% cleaner ✓
vs Target 41% cleaner ✓
A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 99 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 99 KB (8% of page weight)

Unused JS 99 KB

0.02g unnecessary CO2 per visit

Actual transfer 1284 KB
Theoretical minimum 1185 KB
Potential savings 99 KB (0.02g 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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