Sustainability

· 6 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

Carbon Budget

34th percentile

REVIEW

34th percentile

0.44g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 66% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 34th percentile

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

Top 10%

Target

Median website

0.44g

34th percentile

Cleaner than 66% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 26% cleaner ✓

vs Target 12% cleaner ✓

Transfer Efficiency

Action

67% efficient

REVIEW

67% efficient

Transfer efficiency: 67%

An estimated 640 KB (33%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 640 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.

Total waste: 640 KB (33% of page weight)

Unused JS 640 KB

0.15g unnecessary CO2 per visit

Actual transfer 1910 KB

Theoretical minimum 1270 KB

Potential savings 640 KB (0.15g 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

CO2 Per Page Load

0.44g CO2 per view

PASS

0.44g CO2 per view

0.44g CO2 per page view

This page transfers 1.9 MB, producing an estimated 0.44g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.09g, end-user device 0.34g.

Got: 0.44g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 53.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 53.0 kg of CO2 annually — equivalent to charging 6624 smartphones.

Green hosting reduces data center emissions

0.44g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 66% of websites

Sustainable Web Design model v4 · Page size: 1.9 MB

Your site

0.44g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.09g

End-user device

0.34g

At 10,000 monthly views: Monthly: 4.4 kg · Annual: 53.0 kg · ≈ 6624 smartphone charges

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 52 KB (vs 1910 KB first visit). 28 of 30 resources are served from browser cache, saving 0.43g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.44g)

First visit

1910 KB

Repeat visit

52 KB

97% reduction on repeat visits

Saving 0.43g CO2 per returning visitor

28 resources served from cache · 2 resources re-downloaded

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