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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
66
GRADE
D
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
F
CO2 Per Page Load
Action
4.88g CO2 per view
FIX
4.88g CO2 per view
Critical::
4.88g CO2 per page view
This page transfers 20.6 MB, producing an estimated 4.88g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 1.01g, end-user device 3.75g.
Got: 4.88g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 585.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 585.9 kg of CO2 annually — equivalent to charging 73235 smartphones.
Info::
Green hosting reduces data center emissions

4.88g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 20.6 MB

Your site
4.88g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
1.01g
End-user device
3.75g
At 10,000 monthly views: Monthly: 48.8 kg · Annual: 585.9 kg · ≈ 73235 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.88g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

4.88g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 714% more
vs Target 876% more
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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 193 KB (vs 21122 KB first visit). 85 of 86 resources are served from browser cache, saving 4.84g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 4.88g)
First visit
21122 KB
Repeat visit
193 KB

99% reduction on repeat visits

Saving 4.84g CO2 per returning visitor

85 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 383 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 383 KB (2% of page weight)

Unused JS 383 KB

0.09g unnecessary CO2 per visit

Actual transfer 21122 KB
Theoretical minimum 20739 KB
Potential savings 383 KB (0.09g 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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