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

1.99g CO2 per view

FIX

1.99g CO2 per view

1.99g CO2 per page view

This page transfers 8.4 MB, producing an estimated 1.99g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.41g, end-user device 1.53g.

Got: 1.99g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 238.7 kg CO2/year

With 10,000 page views per month, this page would generate approximately 238.7 kg of CO2 annually — equivalent to charging 29834 smartphones.

Green hosting reduces data center emissions

1.99g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 11% of websites

Sustainable Web Design model v4 · Page size: 8.4 MB

Your site

1.99g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.05g

Network

0.41g

End-user device

1.53g

At 10,000 monthly views: Monthly: 19.9 kg · Annual: 238.7 kg · ≈ 29834 smartphone charges

Carbon Budget

Action

89th percentile

FIX

89th percentile

1.99g CO2 — above the median website (0.60g)

Heavier than an estimated 11% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 89th percentile

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

Top 10%

Target

Median website

1.99g

89th percentile

Cleaner than 11% of websites

✗ Above the median website

vs Median 231% more

vs Target 298% more

Transfer Efficiency

80% efficient

REVIEW

80% efficient

Transfer efficiency: 80%

An estimated 1710 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1710 KB of unused JavaScript. This wasted data produces 0.40g of unnecessary CO2 per page view.

Total waste: 1710 KB (20% of page weight)

Unused JS 1710 KB

0.40g unnecessary CO2 per visit

Actual transfer 8605 KB

Theoretical minimum 6894 KB

Potential savings 1710 KB (0.40g 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 Not identified✗CDN Cloudflare✓

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 246 KB (vs 8605 KB first visit). 458 of 467 resources are served from browser cache, saving 1.93g CO2 per repeat visit.

Repeat visit: 0.06g CO2 (first visit: 1.99g)

First visit

8605 KB

Repeat visit

246 KB

97% reduction on repeat visits

Saving 1.93g CO2 per returning visitor

458 resources served from cache · 9 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)

Image Optimization

200 images, 1177 KB total, 9 KB wasted

INFO

Image Optimization Audit

Total Images

200

Total Size

1177 KB

Oversized

Wasted

9 KB

4 missing dimensions

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