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 4 REVIEW 1 FIX

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

CO2 Per Page Load

0.63g CO2 per view

REVIEW

0.63g CO2 per view

0.63g CO2 per page view

This page transfers 2.2 MB, producing an estimated 0.63g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.11g, end-user device 0.40g.

Got: 0.63g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 75.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 75.1 kg of CO2 annually — equivalent to charging 9391 smartphones.

0.63g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 50% of websites

Sustainable Web Design model v4 · Page size: 2.2 MB

Your site

0.63g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.12g

Network

0.11g

End-user device

0.40g

At 10,000 monthly views: Monthly: 6.3 kg · Annual: 75.1 kg · ≈ 9391 smartphone charges

Carbon Budget

50th percentile

REVIEW

50th percentile

0.63g CO2 — above the median website (0.60g)

Heavier than an estimated 50% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 50th percentile

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

Top 10%

Target

Median website

0.63g

50th percentile

Cleaner than 50% of websites

✗ Above the median website

vs Median 4% more

vs Target 25% more

Web Font Weight Variants

5 font weights loaded across 2 famil(y/ies)

REVIEW

5 font weights loaded across 2 famil(y/ies)

5 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, Oswald.

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 9 KB (vs 2263 KB first visit). 48 of 49 resources are served from browser cache, saving 0.62g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.63g)

First visit

2263 KB

Repeat visit

9 KB

100% reduction on repeat visits

Saving 0.62g CO2 per returning visitor

48 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

97% efficient

PASS

97% efficient

Transfer efficiency: 97%

Only 73 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 73 KB (3% of page weight)

Unused JS 73 KB

0.02g unnecessary CO2 per visit

Actual transfer 2263 KB

Theoretical minimum 2190 KB

Potential savings 73 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

19 images, 3844 KB total, 1000 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

3844 KB

Oversized

Wasted

1000 KB

12 missing dimensions

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