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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
79
GRADE
C
FIX
1
REVIEW
1
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 1 REVIEW 1 FIX
D
Transfer Efficiency
Action
42% efficient
FIX
42% efficient
Critical::
Transfer efficiency: 42%
An estimated 1172 KB (58%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1172 KB of unused JavaScript. This wasted data produces 0.27g of unnecessary CO2 per page view.
42% efficient

Total waste: 1172 KB (58% of page weight)

Unused JS 1172 KB

0.27g unnecessary CO2 per visit

Actual transfer 2017 KB
Theoretical minimum 845 KB
Potential savings 1172 KB (0.27g CO2)

See Deep Analysis sections above for specific optimizations.

B
Carbon Budget
36th percentile
REVIEW
36th percentile
Info::
0.47g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 64% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 36th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.47g

36th percentile

Cleaner than 64% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 22% cleaner ✓
vs Target 7% cleaner ✓
A
CO2 Per Page Load
0.47g CO2 per view
PASS
0.47g CO2 per view
Info::
0.47g CO2 per page view
This page transfers 2.0 MB, producing an estimated 0.47g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.36g.
Got: 0.47g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 56.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 56.0 kg of CO2 annually — equivalent to charging 6996 smartphones.
Info::
Green hosting reduces data center emissions

0.47g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 64% of websites

Sustainable Web Design model v4 · Page size: 2.0 MB

Your site
0.47g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.10g
End-user device
0.36g
At 10,000 monthly views: Monthly: 4.7 kg · Annual: 56.0 kg · ≈ 6996 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
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 129 KB (vs 2017 KB first visit). 73 of 75 resources are served from browser cache, saving 0.44g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.47g)
First visit
2017 KB
Repeat visit
129 KB

94% reduction on repeat visits

Saving 0.44g CO2 per returning visitor

73 resources served from cache · 2 resources re-downloaded

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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