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

2.22g CO2 per view

FIX

2.22g CO2 per view

2.22g CO2 per page view

This page transfers 7.8 MB, producing an estimated 2.22g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.41g, network 0.38g, end-user device 1.42g.

Got: 2.22g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 266.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 266.1 kg of CO2 annually — equivalent to charging 33257 smartphones.

2.22g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 7.8 MB

Your site

2.22g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.41g

Network

0.38g

End-user device

1.42g

At 10,000 monthly views: Monthly: 22.2 kg · Annual: 266.1 kg · ≈ 33257 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

95th percentile

FIX

95th percentile

2.22g CO2 — above the median website (0.60g)

Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 95th percentile

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

Top 10%

Target

Median website

2.22g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 270% more

vs Target 343% more

Web Font Weight Variants

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

REVIEW

5 font weights loaded across 1 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: Open Sans.

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 117 KB (vs 8016 KB first visit). 73 of 75 resources are served from browser cache, saving 2.18g CO2 per repeat visit.

Repeat visit: 0.03g CO2 (first visit: 2.22g)

First visit

8016 KB

Repeat visit

117 KB

99% reduction on repeat visits

Saving 2.18g CO2 per returning visitor

73 resources served from cache · 2 resources re-downloaded

A+

Transfer Efficiency

99% efficient

PASS

99% efficient

Transfer efficiency: 99%

Only 85 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 85 KB (1% of page weight)

Unused JS 85 KB

0.02g unnecessary CO2 per visit

Actual transfer 8016 KB

Theoretical minimum 7930 KB

Potential savings 85 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

40 images, 7328 KB total, 6055 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

7328 KB

Oversized

Wasted

6055 KB

18 missing alt text 28 missing dimensions 33 missing lazy loading

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