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

6 PASS 1 REVIEW

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

CO2 Per Page Load

0.39g CO2 per view

PASS

0.39g CO2 per view

0.39g CO2 per page view

This page transfers 1.6 MB, producing an estimated 0.39g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.30g.

Got: 0.39g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 46.7 kg CO2/year

With 10,000 page views per month, this page would generate approximately 46.7 kg of CO2 annually — equivalent to charging 5834 smartphones.

Green hosting reduces data center emissions

0.39g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 72% of websites

Sustainable Web Design model v4 · Page size: 1.6 MB

Your site

0.39g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.08g

End-user device

0.30g

At 10,000 monthly views: Monthly: 3.9 kg · Annual: 46.7 kg · ≈ 5834 smartphone charges

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

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 29 KB (vs 1682 KB first visit). 44 of 45 resources are served from browser cache, saving 0.38g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.39g)

First visit

1682 KB

Repeat visit

29 KB

98% reduction on repeat visits

Saving 0.38g CO2 per returning visitor

44 resources served from cache · 1 resources re-downloaded

Carbon Budget

28th percentile

PASS

28th percentile

0.39g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 72% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 28th percentile

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

Top 10%

Target

Median website

0.39g

28th percentile

Cleaner than 72% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 35% cleaner ✓

vs Target 22% cleaner ✓

A+

Transfer Efficiency

97% efficient

PASS

97% efficient

Transfer efficiency: 97%

Only 56 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 56 KB (3% of page weight)

Unused JS 56 KB

0.01g unnecessary CO2 per visit

Actual transfer 1682 KB

Theoretical minimum 1626 KB

Potential savings 56 KB (0.01g 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

15 images, 1416 KB total, 90 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

1416 KB

Oversized

Wasted

90 KB

8 missing dimensions 1 missing lazy loading

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