Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Device:

Mobile Desktop

Checks

4 PASS 1 REVIEW 2 FIX

CO2 Per Page Load

Action

0.91g CO2 per view

FIX

0.91g CO2 per view

0.91g CO2 per page view

This page transfers 3.8 MB, producing an estimated 0.91g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.19g, end-user device 0.70g.

Got: 0.91g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 109.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 109.0 kg of CO2 annually — equivalent to charging 13627 smartphones.

Green hosting reduces data center emissions

0.91g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 42% of websites

Sustainable Web Design model v4 · Page size: 3.8 MB

Your site

0.91g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.02g

Network

0.19g

End-user device

0.70g

At 10,000 monthly views: Monthly: 9.1 kg · Annual: 109.0 kg · ≈ 13627 smartphone charges

Carbon Budget

Action

58th percentile

FIX

58th percentile

0.91g CO2 — above the median website (0.60g)

Heavier than an estimated 42% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 58th percentile

Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

Top 10%

Target

Median website

0.91g

58th percentile

Cleaner than 42% of websites

✗ Above the median website

vs Median 51% more

vs Target 82% more

Transfer Efficiency

86% efficient

REVIEW

86% efficient

Transfer efficiency: 86%

An estimated 542 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 542 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.

Total waste: 542 KB (14% of page weight)

Unused JS 542 KB

0.13g unnecessary CO2 per visit

Actual transfer 3930 KB

Theoretical minimum 3387 KB

Potential savings 542 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Next.js, CDN: Cloudflare

Next.js: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

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

96% reduction on repeat visits

Returning visitors download only 146 KB (vs 3930 KB first visit). 134 of 146 resources are served from browser cache, saving 0.87g CO2 per repeat visit.

Repeat visit: 0.03g CO2 (first visit: 0.91g)

First visit

3930 KB

Repeat visit

146 KB

96% reduction on repeat visits

Saving 0.87g CO2 per returning visitor

134 resources served from cache · 12 resources re-downloaded

A+

Web Font Weight Variants

2 font weights loaded across 2 famil(y/ies) -- reasonable

PASS

2 font weights loaded across 2 famil(y/ies) -- reasonable

2 font weight(s) loaded across 2 famil(y/ies)

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

Image Optimization

9 images, 517 KB total, 397 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

517 KB

Oversized

Wasted

397 KB

1 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.