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

4 PASS 2 REVIEW

Transfer Efficiency

Action

74% efficient

REVIEW

74% efficient

Transfer efficiency: 74%

An estimated 202 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 202 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.

Total waste: 202 KB (26% of page weight)

Unused JS 202 KB

0.05g unnecessary CO2 per visit

Actual transfer 771 KB

Theoretical minimum 568 KB

Potential savings 202 KB (0.05g 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+

CO2 Per Page Load

0.18g CO2 per view

PASS

0.18g CO2 per view

0.18g CO2 per page view

This page transfers 0.8 MB, producing an estimated 0.18g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.04g, end-user device 0.14g.

Got: 0.18g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 21.4 kg CO2/year

With 10,000 page views per month, this page would generate approximately 21.4 kg of CO2 annually — equivalent to charging 2673 smartphones.

Green hosting reduces data center emissions

0.18g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.8 MB

Your site

0.18g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.00g

Network

0.04g

End-user device

0.14g

At 10,000 monthly views: Monthly: 1.8 kg · Annual: 21.4 kg · ≈ 2673 smartphone charges

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Google Cloud, CDN: Fastly

Google Cloud: Carbon-neutral since 2007, 100% renewable energy matched since 2017

Fastly: 100% renewable energy for edge network

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 Google Cloud✓CDN Fastly✓

Google Cloud: Carbon-neutral since 2007, 100% renewable energy matched since 2017

Fastly: 100% renewable energy for edge network

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 21 KB (vs 771 KB first visit). 52 of 53 resources are served from browser cache, saving 0.17g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.18g)

First visit

771 KB

Repeat visit

21 KB

97% reduction on repeat visits

Saving 0.17g CO2 per returning visitor

52 resources served from cache · 1 resources re-downloaded

A+

Carbon Budget

10th percentile

PASS

10th percentile

0.18g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 10th percentile

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

Top 10%

Target

Median website

0.18g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 70% cleaner ✓

vs Target 64% cleaner ✓

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