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

2 PASS 2 REVIEW 3 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 3.2 MB, producing an estimated 0.90g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.17g, network 0.16g, end-user device 0.58g.

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

At 10,000 monthly views: 107.7 kg CO2/year

With 10,000 page views per month, this page would generate approximately 107.7 kg of CO2 annually — equivalent to charging 13456 smartphones.

0.90g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 42% of websites

Sustainable Web Design model v4 · Page size: 3.2 MB

Your site

0.90g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.17g

Network

0.16g

End-user device

0.58g

At 10,000 monthly views: Monthly: 9.0 kg · Annual: 107.7 kg · ≈ 13456 smartphone charges

Green Hosting

Action

Unknown

FIX

Unknown

Hosting provider could not be identified

Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.

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 HostingUnable to Determine

Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

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 50% more

vs Target 79% more

Transfer Efficiency

87% efficient

REVIEW

87% efficient

Transfer efficiency: 87%

An estimated 407 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 407 KB of unused JavaScript. This wasted data produces 0.11g of unnecessary CO2 per page view.

Total waste: 407 KB (13% of page weight)

Unused JS 407 KB

0.11g unnecessary CO2 per visit

Actual transfer 3243 KB

Theoretical minimum 2836 KB

Potential savings 407 KB (0.11g CO2)

See Deep Analysis sections above for specific optimizations.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 47 KB (vs 3243 KB first visit). 69 of 70 resources are served from browser cache, saving 0.88g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.90g)

First visit

3243 KB

Repeat visit

47 KB

99% reduction on repeat visits

Saving 0.88g CO2 per returning visitor

69 resources served from cache · 1 resources re-downloaded

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

33 images, 190 KB total, 157 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

190 KB

Oversized

Wasted

157 KB

32 missing lazy loading

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