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

0.90g CO2 per view

FIX

0.90g CO2 per view

0.90g CO2 per page view

This page transfers 3.8 MB, producing an estimated 0.90g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.19g, end-user device 0.69g.

Got: 0.90g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 108.5 kg CO2/year

With 10,000 page views per month, this page would generate approximately 108.5 kg of CO2 annually — equivalent to charging 13566 smartphones.

Green hosting reduces data center emissions

0.90g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 42% of websites

Sustainable Web Design model v4 · Page size: 3.8 MB

Your site

0.90g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.02g

Network

0.19g

End-user device

0.69g

At 10,000 monthly views: Monthly: 9.0 kg · Annual: 108.5 kg · ≈ 13566 smartphone charges

Carbon Budget

Action

58th percentile

FIX

58th percentile

0.90g CO2 — above the median website (0.60g)

Heavier than an estimated 42% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 58th percentile

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

Top 10%

Target

Median website

0.90g

58th percentile

Cleaner than 42% of websites

✗ Above the median website

vs Median 51% more

vs Target 81% 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

95% cached

PASS

95% cached

95% reduction on repeat visits

Returning visitors download only 197 KB (vs 3912 KB first visit). 98 of 103 resources are served from browser cache, saving 0.86g CO2 per repeat visit.

Repeat visit: 0.05g CO2 (first visit: 0.90g)

First visit

3912 KB

Repeat visit

197 KB

95% reduction on repeat visits

Saving 0.86g CO2 per returning visitor

98 resources served from cache · 5 resources re-downloaded

A+

Transfer Efficiency

92% efficient

PASS

92% efficient

Transfer efficiency: 92%

Only 301 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 301 KB (8% of page weight)

Unused JS 301 KB

0.07g unnecessary CO2 per visit

Actual transfer 3912 KB

Theoretical minimum 3611 KB

Potential savings 301 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.