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

3 PASS 2 REVIEW 2 FIX

CO2 Per Page Load

Action

1.03g CO2 per view

FIX

1.03g CO2 per view

1.03g CO2 per page view

This page transfers 4.4 MB, producing an estimated 1.03g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.21g, end-user device 0.79g.

Got: 1.03g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 124.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 124.0 kg of CO2 annually — equivalent to charging 15497 smartphones.

Green hosting reduces data center emissions

1.03g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 38% of websites

Sustainable Web Design model v4 · Page size: 4.4 MB

Your site

1.03g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.03g

Network

0.21g

End-user device

0.79g

At 10,000 monthly views: Monthly: 10.3 kg · Annual: 124.0 kg · ≈ 15497 smartphone charges

Carbon Budget

Action

62th percentile

FIX

62th percentile

1.03g CO2 — above the median website (0.60g)

Heavier than an estimated 38% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 62th percentile

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

Top 10%

Target

Median website

1.03g

62nd percentile

Cleaner than 38% of websites

✗ Above the median website

vs Median 72% more

vs Target 107% more

Transfer Efficiency

89% efficient

REVIEW

89% efficient

Transfer efficiency: 89%

An estimated 511 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 511 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.

Total waste: 511 KB (11% of page weight)

Unused JS 511 KB

0.12g unnecessary CO2 per visit

Actual transfer 4469 KB

Theoretical minimum 3958 KB

Potential savings 511 KB (0.12g CO2)

See Deep Analysis sections above for specific optimizations.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

Green Hosting

Green (cdn)

PASS

Green (cdn)

Cloudflare CDN uses renewable energy

Since most traffic is served through the CDN, the majority of data transfer energy is renewable.

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 GoDaddy✗CDN Cloudflare✓

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 101 KB (vs 4469 KB first visit). 308 of 311 resources are served from browser cache, saving 1.01g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 1.03g)

First visit

4469 KB

Repeat visit

101 KB

98% reduction on repeat visits

Saving 1.01g CO2 per returning visitor

308 resources served from cache · 3 resources re-downloaded

A+

Web Font Weight Variants

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

PASS

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

3 font weight(s) loaded across 1 famil(y/ies)

Image Optimization

96 images, 649 KB total, 59 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

649 KB

Oversized

Wasted

59 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.