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

2.13g CO2 per view

FIX

2.13g CO2 per view

2.13g CO2 per page view

This page transfers 9.0 MB, producing an estimated 2.13g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.44g, end-user device 1.64g.

Got: 2.13g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 255.9 kg CO2/year

With 10,000 page views per month, this page would generate approximately 255.9 kg of CO2 annually — equivalent to charging 31990 smartphones.

Green hosting reduces data center emissions

2.13g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 9.0 MB

Your site

2.13g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.05g

Network

0.44g

End-user device

1.64g

At 10,000 monthly views: Monthly: 21.3 kg · Annual: 255.9 kg · ≈ 31990 smartphone charges

Carbon Budget

Action

95th percentile

FIX

95th percentile

2.13g CO2 — above the median website (0.60g)

Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 95th percentile

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

Top 10%

Target

Median website

2.13g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 255% more

vs Target 327% more

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

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

91% cached

PASS

91% cached

91% reduction on repeat visits

Returning visitors download only 847 KB (vs 9226 KB first visit). 322 of 336 resources are served from browser cache, saving 1.94g CO2 per repeat visit.

Repeat visit: 0.20g CO2 (first visit: 2.13g)

First visit

9226 KB

Repeat visit

847 KB

91% reduction on repeat visits

Saving 1.94g CO2 per returning visitor

322 resources served from cache · 14 resources re-downloaded

A+

Transfer Efficiency

96% efficient

PASS

96% efficient

Transfer efficiency: 96%

Only 344 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 344 KB (4% of page weight)

Unused JS 344 KB

0.08g unnecessary CO2 per visit

Actual transfer 9226 KB

Theoretical minimum 8882 KB

Potential savings 344 KB (0.08g CO2)

See Deep Analysis sections above for specific optimizations.

A+

Web Font Weight Variants

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

PASS

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

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

Image Optimization

105 images, 2506 KB total, 1737 KB wasted

INFO

Image Optimization Audit

Total Images

105

Total Size

2506 KB

Oversized

Wasted

1737 KB

93 missing dimensions 101 missing lazy loading

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