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

1.08g CO2 per view

FIX

1.08g CO2 per view

1.08g CO2 per page view

This page transfers 3.8 MB, producing an estimated 1.08g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.20g, network 0.19g, end-user device 0.69g.

Got: 1.08g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 129.5 kg CO2/year

With 10,000 page views per month, this page would generate approximately 129.5 kg of CO2 annually — equivalent to charging 16182 smartphones.

1.08g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 37% of websites

Sustainable Web Design model v4 · Page size: 3.8 MB

Your site

1.08g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.20g

Network

0.19g

End-user device

0.69g

At 10,000 monthly views: Monthly: 10.8 kg · Annual: 129.5 kg · ≈ 16182 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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

63th percentile

FIX

63th percentile

1.08g CO2 — above the median website (0.60g)

Heavier than an estimated 37% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 63th percentile

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

Top 10%

Target

Median website

1.08g

63rd percentile

Cleaner than 37% of websites

✗ Above the median website

vs Median 80% more

vs Target 116% 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

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 30 KB (vs 3900 KB first visit). 56 of 57 resources are served from browser cache, saving 1.07g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 1.08g)

First visit

3900 KB

Repeat visit

30 KB

99% reduction on repeat visits

Saving 1.07g CO2 per returning visitor

56 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

97% efficient

PASS

97% efficient

Transfer efficiency: 97%

Only 116 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 116 KB (3% of page weight)

Unused JS 116 KB

0.03g unnecessary CO2 per visit

Actual transfer 3900 KB

Theoretical minimum 3784 KB

Potential savings 116 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

13 images, 873 KB total, 366 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

873 KB

Oversized

Wasted

366 KB

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