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

1.95g CO2 per view

FIX

1.95g CO2 per view

1.95g CO2 per page view

This page transfers 8.2 MB, producing an estimated 1.95g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.40g, end-user device 1.50g.

Got: 1.95g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 234.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 234.3 kg of CO2 annually — equivalent to charging 29282 smartphones.

Green hosting reduces data center emissions

1.95g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 12% of websites

Sustainable Web Design model v4 · Page size: 8.2 MB

Your site

1.95g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.05g

Network

0.40g

End-user device

1.50g

At 10,000 monthly views: Monthly: 19.5 kg · Annual: 234.3 kg · ≈ 29282 smartphone charges

Carbon Budget

Action

88th percentile

FIX

88th percentile

1.95g CO2 — above the median website (0.60g)

Heavier than an estimated 12% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 88th percentile

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

Top 10%

Target

Median website

1.95g

88th percentile

Cleaner than 12% of websites

✗ Above the median website

vs Median 225% more

vs Target 290% more

Transfer Efficiency

80% efficient

REVIEW

80% efficient

Transfer efficiency: 80%

An estimated 1671 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1671 KB of unused JavaScript. This wasted data produces 0.39g of unnecessary CO2 per page view.

Total waste: 1671 KB (20% of page weight)

Unused JS 1671 KB

0.39g unnecessary CO2 per visit

Actual transfer 8445 KB

Theoretical minimum 6773 KB

Potential savings 1671 KB (0.39g 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 247 KB (vs 8445 KB first visit). 466 of 475 resources are served from browser cache, saving 1.89g CO2 per repeat visit.

Repeat visit: 0.06g CO2 (first visit: 1.95g)

First visit

8445 KB

Repeat visit

247 KB

97% reduction on repeat visits

Saving 1.89g CO2 per returning visitor

466 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.