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

4 PASS 1 REVIEW 2 FIX

CO2 Per Page Load

Action

0.97g CO2 per view

FIX

0.97g CO2 per view

0.97g CO2 per page view

This page transfers 4.1 MB, producing an estimated 0.97g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.20g, end-user device 0.75g.

Got: 0.97g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 116.7 kg CO2/year

With 10,000 page views per month, this page would generate approximately 116.7 kg of CO2 annually — equivalent to charging 14585 smartphones.

Green hosting reduces data center emissions

0.97g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 40% of websites

Sustainable Web Design model v4 · Page size: 4.1 MB

Your site

0.97g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.02g

Network

0.20g

End-user device

0.75g

At 10,000 monthly views: Monthly: 9.7 kg · Annual: 116.7 kg · ≈ 14585 smartphone charges

Carbon Budget

Action

60th percentile

FIX

60th percentile

0.97g CO2 — above the median website (0.60g)

Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 60th percentile

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

Top 10%

Target

Median website

0.97g

60th percentile

Cleaner than 40% of websites

✗ Above the median website

vs Median 62% more

vs Target 94% more

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

Google Cloud uses renewable energy

Google Cloud: Verified by the Green Web Foundation

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 Not identified✗

Google Cloud: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

96% cached

PASS

96% cached

96% reduction on repeat visits

Returning visitors download only 185 KB (vs 4206 KB first visit). 85 of 90 resources are served from browser cache, saving 0.93g CO2 per repeat visit.

Repeat visit: 0.04g CO2 (first visit: 0.97g)

First visit

4206 KB

Repeat visit

185 KB

96% reduction on repeat visits

Saving 0.93g CO2 per returning visitor

85 resources served from cache · 5 resources re-downloaded

A+

Transfer Efficiency

93% efficient

PASS

93% efficient

Transfer efficiency: 93%

Only 303 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 303 KB (7% of page weight)

Unused JS 303 KB

0.07g unnecessary CO2 per visit

Actual transfer 4206 KB

Theoretical minimum 3903 KB

Potential savings 303 KB (0.07g CO2)

See Deep Analysis sections above for specific optimizations.

A+

Web Font Weight Variants

2 font weights loaded across 1 famil(y/ies) -- reasonable

PASS

2 font weights loaded across 1 famil(y/ies) -- reasonable

2 font weight(s) loaded across 1 famil(y/ies)

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

Image Optimization

25 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

Oversized

1 missing alt text 23 missing dimensions 22 missing lazy loading

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