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

1 PASS 2 REVIEW 3 FIX

CO2 Per Page Load

Action

1.48g CO2 per view

FIX

1.48g CO2 per view

1.48g CO2 per page view

This page transfers 5.2 MB, producing an estimated 1.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.26g, end-user device 0.95g.

Got: 1.48g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 177.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 177.3 kg of CO2 annually — equivalent to charging 22163 smartphones.

1.48g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 25% of websites

Sustainable Web Design model v4 · Page size: 5.2 MB

Your site

1.48g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.27g

Network

0.26g

End-user device

0.95g

At 10,000 monthly views: Monthly: 14.8 kg · Annual: 177.3 kg · ≈ 22163 smartphone charges

Green Hosting

Action

Not green

FIX

Not green

No confirmed renewable energy commitment detected

Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

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 HostingNot Green Hosted

Hosting AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

75th percentile

FIX

75th percentile

1.48g CO2 — above the median website (0.60g)

Heavier than an estimated 25% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 75th percentile

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

Top 10%

Target

Median website

1.48g

75th percentile

Cleaner than 25% of websites

✗ Above the median website

vs Median 146% more

vs Target 196% more

Transfer Efficiency

Action

64% efficient

REVIEW

64% efficient

Transfer efficiency: 64%

An estimated 1937 KB (36%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1937 KB of unused JavaScript. This wasted data produces 0.54g of unnecessary CO2 per page view.

Total waste: 1937 KB (36% of page weight)

Unused JS 1937 KB

0.54g unnecessary CO2 per visit

Actual transfer 5342 KB

Theoretical minimum 3405 KB

Potential savings 1937 KB (0.54g 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

A+

Repeat Visit Weight

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 167 KB (vs 5342 KB first visit). 300 of 304 resources are served from browser cache, saving 1.43g CO2 per repeat visit.

Repeat visit: 0.05g CO2 (first visit: 1.48g)

First visit

5342 KB

Repeat visit

167 KB

97% reduction on repeat visits

Saving 1.43g CO2 per returning visitor

300 resources served from cache · 4 resources re-downloaded

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