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

5.21g CO2 per view

FIX

5.21g CO2 per view

5.21g CO2 per page view

This page transfers 22.0 MB, producing an estimated 5.21g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 1.08g, end-user device 4.00g.

Got: 5.21g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 625.2 kg CO2/year

With 10,000 page views per month, this page would generate approximately 625.2 kg of CO2 annually — equivalent to charging 78144 smartphones.

Green hosting reduces data center emissions

5.21g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 22.0 MB

Your site

5.21g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.13g

Network

1.08g

End-user device

4.00g

At 10,000 monthly views: Monthly: 52.1 kg · Annual: 625.2 kg · ≈ 78144 smartphone charges

Carbon Budget

Action

95th percentile

FIX

95th percentile

5.21g 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

5.21g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 768% more

vs Target 942% 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

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 291 KB (vs 22538 KB first visit). 491 of 498 resources are served from browser cache, saving 5.14g CO2 per repeat visit.

Repeat visit: 0.07g CO2 (first visit: 5.21g)

First visit

22538 KB

Repeat visit

291 KB

99% reduction on repeat visits

Saving 5.14g CO2 per returning visitor

491 resources served from cache · 7 resources re-downloaded

A+

Transfer Efficiency

98% efficient

PASS

98% efficient

Transfer efficiency: 98%

Only 424 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 424 KB (2% of page weight)

Unused JS 424 KB

0.10g unnecessary CO2 per visit

Actual transfer 22538 KB

Theoretical minimum 22113 KB

Potential savings 424 KB (0.10g 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

106 images, 4974 KB total, 2455 KB wasted

INFO

Image Optimization Audit

Total Images

106

Total Size

4974 KB

Oversized

Wasted

2455 KB

1 missing alt text 71 missing dimensions 67 missing lazy loading

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