Sustainability

· 7 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

2.09g CO2 per view

FIX

2.09g CO2 per view

2.09g CO2 per page view

This page transfers 7.4 MB, producing an estimated 2.09g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.39g, network 0.36g, end-user device 1.34g.

Got: 2.09g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 251.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 251.0 kg of CO2 annually — equivalent to charging 31373 smartphones.

2.09g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 7.4 MB

Your site

2.09g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.39g

Network

0.36g

End-user device

1.34g

At 10,000 monthly views: Monthly: 20.9 kg · Annual: 251.0 kg · ≈ 31373 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.

Akamai: Committed to 50% renewable by 2030

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 Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

95th percentile

FIX

95th percentile

2.09g 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

2.09g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 249% more

vs Target 318% 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 77 KB (vs 7562 KB first visit). 322 of 324 resources are served from browser cache, saving 2.07g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 2.09g)

First visit

7562 KB

Repeat visit

77 KB

99% reduction on repeat visits

Saving 2.07g CO2 per returning visitor

322 resources served from cache · 2 resources re-downloaded

A+

Transfer Efficiency

90% efficient

PASS

90% efficient

Transfer efficiency: 90%

Only 718 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 718 KB (10% of page weight)

Unused JS 718 KB

0.20g unnecessary CO2 per visit

Actual transfer 7562 KB

Theoretical minimum 6844 KB

Potential savings 718 KB (0.20g CO2)

See Deep Analysis sections above for specific optimizations.

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