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

5 PASS 2 REVIEW

Web Font Weight Variants

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

REVIEW

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

6 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: Merriweather, Source Sans 3.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

CO2 Per Page Load

0.21g CO2 per view

PASS

0.21g CO2 per view

0.21g CO2 per page view

This page transfers 0.9 MB, producing an estimated 0.21g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.04g, end-user device 0.16g.

Got: 0.21g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 25.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 25.1 kg of CO2 annually — equivalent to charging 3141 smartphones.

Green hosting reduces data center emissions

0.21g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.9 MB

Your site

0.21g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.04g

End-user device

0.16g

At 10,000 monthly views: Monthly: 2.1 kg · Annual: 25.1 kg · ≈ 3141 smartphone charges

Green Hosting

Green (cdn)

PASS

Green (cdn)

Netlify CDN uses renewable energy

Since most traffic is served through the CDN, the majority of data transfer energy is renewable.

Netlify: Hosted on AWS/Google Cloud with renewable energy matching

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 Not identified✗CDN Netlify✓

Netlify: Hosted on AWS/Google Cloud with renewable energy matching

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 8 KB (vs 906 KB first visit). 16 of 17 resources are served from browser cache, saving 0.21g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.21g)

First visit

906 KB

Repeat visit

8 KB

99% reduction on repeat visits

Saving 0.21g CO2 per returning visitor

16 resources served from cache · 1 resources re-downloaded

A+

Carbon Budget

10th percentile

PASS

10th percentile

0.21g 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

0.21g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 65% cleaner ✓

vs Target 58% 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 906 KB

Theoretical minimum 906 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

10 images, 470 KB total, 465 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

470 KB

Oversized

Wasted

465 KB

9 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.