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 2 REVIEW 1 FIX

Carbon Budget

Action

54th percentile

FIX

54th percentile

0.75g CO2 — above the median website (0.60g)

Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 54th percentile

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

Top 10%

Target

Median website

0.75g

54th percentile

Cleaner than 46% of websites

✗ Above the median website

vs Median 25% more

vs Target 50% more

CO2 Per Page Load

0.75g CO2 per view

REVIEW

0.75g CO2 per view

0.75g CO2 per page view

This page transfers 3.2 MB, producing an estimated 0.75g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.15g, end-user device 0.58g.

Got: 0.75g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 89.9 kg CO2/year

With 10,000 page views per month, this page would generate approximately 89.9 kg of CO2 annually — equivalent to charging 11241 smartphones.

Green hosting reduces data center emissions

0.75g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 46% of websites

Sustainable Web Design model v4 · Page size: 3.2 MB

Your site

0.75g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.02g

Network

0.15g

End-user device

0.58g

At 10,000 monthly views: Monthly: 7.5 kg · Annual: 89.9 kg · ≈ 11241 smartphone charges

Transfer Efficiency

89% efficient

REVIEW

89% efficient

Transfer efficiency: 89%

An estimated 363 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 363 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.

Total waste: 363 KB (11% of page weight)

Unused JS 363 KB

0.08g unnecessary CO2 per visit

Actual transfer 3242 KB

Theoretical minimum 2878 KB

Potential savings 363 KB (0.08g 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: Cloudflare, CDN: Cloudflare

Cloudflare: 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 Cloudflare✓CDN Cloudflare✓

Cloudflare: 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

93% cached

PASS

93% cached

93% reduction on repeat visits

Returning visitors download only 243 KB (vs 3242 KB first visit). 235 of 237 resources are served from browser cache, saving 0.69g CO2 per repeat visit.

Repeat visit: 0.06g CO2 (first visit: 0.75g)

First visit

3242 KB

Repeat visit

243 KB

93% reduction on repeat visits

Saving 0.69g CO2 per returning visitor

235 resources served from cache · 2 resources re-downloaded

A+

Web Font Weight Variants

1 font weights loaded across 1 famil(y/ies) -- reasonable

PASS

1 font weights loaded across 1 famil(y/ies) -- reasonable

1 font weight(s) loaded across 1 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

30 images, 100 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

100 KB

2 missing lazy loading

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