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

53th percentile

FIX

53th percentile

0.71g CO2 — above the median website (0.60g)

Heavier than an estimated 47% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 53th percentile

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

Top 10%

Target

Median website

0.71g

53rd percentile

Cleaner than 47% of websites

✗ Above the median website

vs Median 18% more

vs Target 42% more

CO2 Per Page Load

0.71g CO2 per view

REVIEW

0.71g CO2 per view

0.71g CO2 per page view

This page transfers 3.0 MB, producing an estimated 0.71g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.15g, end-user device 0.55g.

Got: 0.71g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 85.2 kg CO2/year

With 10,000 page views per month, this page would generate approximately 85.2 kg of CO2 annually — equivalent to charging 10644 smartphones.

Green hosting reduces data center emissions

0.71g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 47% of websites

Sustainable Web Design model v4 · Page size: 3.0 MB

Your site

0.71g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.02g

Network

0.15g

End-user device

0.55g

At 10,000 monthly views: Monthly: 7.1 kg · Annual: 85.2 kg · ≈ 10644 smartphone charges

Transfer Efficiency

83% efficient

REVIEW

83% efficient

Transfer efficiency: 83%

An estimated 530 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 530 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.

Total waste: 530 KB (17% of page weight)

Unused JS 530 KB

0.12g unnecessary CO2 per visit

Actual transfer 3070 KB

Theoretical minimum 2540 KB

Potential savings 530 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 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 60 KB (vs 3070 KB first visit). 57 of 59 resources are served from browser cache, saving 0.70g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.71g)

First visit

3070 KB

Repeat visit

60 KB

98% reduction on repeat visits

Saving 0.70g CO2 per returning visitor

57 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)

Image Optimization

21 images, 232 KB total, 40 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

232 KB

Oversized

Wasted

40 KB

13 missing lazy loading

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