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

1.43g CO2 per view

FIX

1.43g CO2 per view

1.43g CO2 per page view

This page transfers 5.0 MB, producing an estimated 1.43g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.26g, network 0.25g, end-user device 0.92g.

Got: 1.43g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 171.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 171.3 kg of CO2 annually — equivalent to charging 21410 smartphones.

1.43g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 27% of websites

Sustainable Web Design model v4 · Page size: 5.0 MB

Your site

1.43g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.26g

Network

0.25g

End-user device

0.92g

At 10,000 monthly views: Monthly: 14.3 kg · Annual: 171.3 kg · ≈ 21410 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

73th percentile

FIX

73th percentile

1.43g CO2 — above the median website (0.60g)

Heavier than an estimated 27% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 73th percentile

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

Top 10%

Target

Median website

1.43g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 138% more

vs Target 185% more

Web Font Weight Variants

6 font weights loaded across 1 famil(y/ies)

REVIEW

6 font weights loaded across 1 famil(y/ies)

6 font weights loaded -- review whether all are used

5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Montserrat.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 16 KB (vs 5161 KB first visit). 142 of 143 resources are served from browser cache, saving 1.42g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 1.43g)

First visit

5161 KB

Repeat visit

16 KB

100% reduction on repeat visits

Saving 1.42g CO2 per returning visitor

142 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

100% efficient

PASS

100% efficient

Transfer efficiency: 100%

Only 0 KB of potential savings identified. Your page is well-optimized for size.

Actual transfer 5161 KB

Theoretical minimum 5161 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

40 images, 994 KB total, 396 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

994 KB

Oversized

Wasted

396 KB

4 missing alt text 11 missing dimensions 39 missing lazy loading

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