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

1.03g CO2 per view

FIX

1.03g CO2 per view

1.03g CO2 per page view

This page transfers 3.6 MB, producing an estimated 1.03g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.19g, network 0.18g, end-user device 0.66g.

Got: 1.03g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 123.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 123.3 kg of CO2 annually — equivalent to charging 15417 smartphones.

1.03g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 38% of websites

Sustainable Web Design model v4 · Page size: 3.6 MB

Your site

1.03g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.19g

Network

0.18g

End-user device

0.66g

At 10,000 monthly views: Monthly: 10.3 kg · Annual: 123.3 kg · ≈ 15417 smartphone charges

Green Hosting

Action

Not green

FIX

Not green

No confirmed renewable energy commitment detected

Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.

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 HostingNot Green Hosted

Hosting Not identified✗CDN Shopify✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

62th percentile

FIX

62th percentile

1.03g CO2 — above the median website (0.60g)

Heavier than an estimated 38% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 62th percentile

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

Top 10%

Target

Median website

1.03g

62nd percentile

Cleaner than 38% of websites

✗ Above the median website

vs Median 71% more

vs Target 106% more

Web Font Weight Variants

No detectable Google Fonts weights

REVIEW

No detectable Google Fonts weights

The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 116 KB (vs 3716 KB first visit). 523 of 529 resources are served from browser cache, saving 1.00g CO2 per repeat visit.

Repeat visit: 0.03g CO2 (first visit: 1.03g)

First visit

3716 KB

Repeat visit

116 KB

97% reduction on repeat visits

Saving 1.00g CO2 per returning visitor

523 resources served from cache · 6 resources re-downloaded

A+

Transfer Efficiency

94% efficient

PASS

94% efficient

Transfer efficiency: 94%

Only 220 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 220 KB (6% of page weight)

Unused JS 220 KB

0.06g unnecessary CO2 per visit

Actual transfer 3716 KB

Theoretical minimum 3495 KB

Potential savings 220 KB (0.06g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

171 images, 212 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

171

Total Size

212 KB

8 missing lazy loading

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