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 3 REVIEW 1 FIX

Carbon Budget

Action

52th percentile

FIX

52th percentile

0.70g CO2 — above the median website (0.60g)

Heavier than an estimated 48% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 52th percentile

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

Top 10%

Target

Median website

0.70g

52nd percentile

Cleaner than 48% of websites

✗ Above the median website

vs Median 17% more

vs Target 41% more

CO2 Per Page Load

0.70g CO2 per view

REVIEW

0.70g CO2 per view

0.70g CO2 per page view

This page transfers 3.0 MB, producing an estimated 0.70g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.15g, end-user device 0.54g.

Got: 0.70g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 84.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 84.6 kg of CO2 annually — equivalent to charging 10574 smartphones.

Green hosting reduces data center emissions

0.70g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 48% of websites

Sustainable Web Design model v4 · Page size: 3.0 MB

Your site

0.70g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.02g

Network

0.15g

End-user device

0.54g

At 10,000 monthly views: Monthly: 7.0 kg · Annual: 84.6 kg · ≈ 10574 smartphone charges

Transfer Efficiency

80% efficient

REVIEW

80% efficient

Transfer efficiency: 80%

An estimated 609 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 609 KB of unused JavaScript. This wasted data produces 0.14g of unnecessary CO2 per page view.

Total waste: 609 KB (20% of page weight)

Unused JS 609 KB

0.14g unnecessary CO2 per visit

Actual transfer 3049 KB

Theoretical minimum 2440 KB

Potential savings 609 KB (0.14g 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

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 73 KB (vs 3049 KB first visit). 137 of 138 resources are served from browser cache, saving 0.69g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 0.70g)

First visit

3049 KB

Repeat visit

73 KB

98% reduction on repeat visits

Saving 0.69g CO2 per returning visitor

137 resources served from cache · 1 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

35 images, 13 KB total, 13 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

13 KB

Oversized

Wasted

13 KB

5 missing alt text 23 missing dimensions 34 missing lazy loading

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