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

4 PASS 3 REVIEW

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

Google Cloud uses renewable energy

Google Cloud: Verified by the Green Web Foundation

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 Hosting✓ Green Hosted

Hosting Google Cloud✓CDN Not identified✗

Google Cloud: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

Repeat Visit Weight

Action

42% cached

REVIEW

42% cached

Only 42% reduction on repeat visits

Returning visitors still download 5 KB — only 42% less than the first visit (9 KB). 2 resources lack proper caching headers. See the Performance tab's HTTP Caching section for specific recommendations.

Repeat visit: 0.00g CO2 (first visit: 0.00g)

First visit

9 KB

Repeat visit

5 KB

42% reduction on repeat visits

Saving 0.00g CO2 per returning visitor

10 resources served from cache · 2 resources re-downloaded

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.

A+

CO2 Per Page Load

0.00g CO2 per view

PASS

0.00g CO2 per view

0.00g CO2 per page view

This page transfers 0.0 MB, producing an estimated 0.00g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.00g, end-user device 0.00g.

Got: 0.00g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 0.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 0.3 kg of CO2 annually — equivalent to charging 31 smartphones.

Green hosting reduces data center emissions

0.00g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.0 MB

Your site

0.00g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.00g

Network

0.00g

End-user device

0.00g

At 10,000 monthly views: Monthly: 0.0 kg · Annual: 0.3 kg · ≈ 31 smartphone charges

A+

Carbon Budget

10th percentile

PASS

10th percentile

0.00g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 10th percentile

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

Top 10%

Target

Median website

0.00g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 100% cleaner ✓

vs Target 100% cleaner ✓

A+

Transfer Efficiency

100% efficient

PASS

100% efficient

Transfer efficiency: 100%

Only 0 KB of potential savings identified. Your page is well-optimized for size.

Actual transfer 9 KB

Theoretical minimum 9 KB

See Deep Analysis sections above for specific optimizations.

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

Image Optimization

120 images, 28 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

120

Total Size

28 KB

14 missing dimensions 1 missing lazy loading

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