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

0.84g CO2 per view

FIX

0.84g CO2 per view

0.84g CO2 per page view

This page transfers 3.0 MB, producing an estimated 0.84g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.16g, network 0.15g, end-user device 0.54g.

Got: 0.84g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 100.7 kg CO2/year

With 10,000 page views per month, this page would generate approximately 100.7 kg of CO2 annually — equivalent to charging 12593 smartphones.

0.84g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 44% of websites

Sustainable Web Design model v4 · Page size: 3.0 MB

Your site

0.84g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.16g

Network

0.15g

End-user device

0.54g

At 10,000 monthly views: Monthly: 8.4 kg · Annual: 100.7 kg · ≈ 12593 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

56th percentile

FIX

56th percentile

0.84g CO2 — above the median website (0.60g)

Heavier than an estimated 44% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 56th percentile

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

Top 10%

Target

Median website

0.84g

56th percentile

Cleaner than 44% of websites

✗ Above the median website

vs Median 40% more

vs Target 68% more

Web Font Weight Variants

Action

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

REVIEW

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

21 font weights loaded -- likely 100+ KB of unused payload

Loading 21 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Roboto, Source Sans Pro%3A200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C600%2C600italic%2C700%2C700italic%2C900%2C900italic%7CMontserrat%3A100%2C200%2C300%2C400%2C500%2C600%2C700%2C800%2C900%2C100italic%2C200italic%2C300italic%2C400italic%2C500italic%2C600italic%2C700italic%2C800italic%2C900italic.

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 36 KB (vs 3035 KB first visit). 46 of 48 resources are served from browser cache, saving 0.83g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.84g)

First visit

3035 KB

Repeat visit

36 KB

99% reduction on repeat visits

Saving 0.83g CO2 per returning visitor

46 resources served from cache · 2 resources re-downloaded

A+

Transfer Efficiency

99% efficient

PASS

99% efficient

Transfer efficiency: 99%

Only 22 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 22 KB (1% of page weight)

Unused JS 22 KB

0.01g unnecessary CO2 per visit

Actual transfer 3035 KB

Theoretical minimum 3013 KB

Potential savings 22 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

8 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

Oversized

3 missing dimensions 6 missing lazy loading

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