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

2.40g CO2 per view

FIX

2.40g CO2 per view

2.40g CO2 per page view

This page transfers 8.5 MB, producing an estimated 2.40g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.44g, network 0.41g, end-user device 1.54g.

Got: 2.40g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 287.8 kg CO2/year

With 10,000 page views per month, this page would generate approximately 287.8 kg of CO2 annually — equivalent to charging 35970 smartphones.

2.40g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.5 MB

Your site

2.40g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.44g

Network

0.41g

End-user device

1.54g

At 10,000 monthly views: Monthly: 24.0 kg · Annual: 287.8 kg · ≈ 35970 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

2.40g 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

2.40g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 300% more

vs Target 380% 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 8670 KB first visit). 313 of 315 resources are served from browser cache, saving 2.38g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 2.40g)

First visit

8670 KB

Repeat visit

77 KB

99% reduction on repeat visits

Saving 2.38g CO2 per returning visitor

313 resources served from cache · 2 resources re-downloaded

A+

Transfer Efficiency

92% efficient

PASS

92% efficient

Transfer efficiency: 92%

Only 720 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 720 KB (8% of page weight)

Unused JS 720 KB

0.20g unnecessary CO2 per visit

Actual transfer 8670 KB

Theoretical minimum 7949 KB

Potential savings 720 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.