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 1 REVIEW 2 FIX

CO2 Per Page Load

Action

2.82g CO2 per view

FIX

2.82g CO2 per view

2.82g CO2 per page view

This page transfers 11.9 MB, producing an estimated 2.82g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.58g, end-user device 2.16g.

Got: 2.82g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 338.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 338.1 kg of CO2 annually — equivalent to charging 42264 smartphones.

Green hosting reduces data center emissions

2.82g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 11.9 MB

Your site

2.82g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.07g

Network

0.58g

End-user device

2.16g

At 10,000 monthly views: Monthly: 28.2 kg · Annual: 338.1 kg · ≈ 42264 smartphone charges

Carbon Budget

Action

95th percentile

FIX

95th percentile

2.82g 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

2.82g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 370% more

vs Target 464% more

Transfer Efficiency

90% efficient

REVIEW

90% efficient

Transfer efficiency: 90%

An estimated 1264 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1264 KB of unused JavaScript. This wasted data produces 0.29g of unnecessary CO2 per page view.

Total waste: 1264 KB (10% of page weight)

Unused JS 1264 KB

0.29g unnecessary CO2 per visit

Actual transfer 12190 KB

Theoretical minimum 10925 KB

Potential savings 1264 KB (0.29g CO2)

See Deep Analysis sections above for specific optimizations.

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Amazon Web Services, CDN: Cloudflare

Amazon Web Services: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

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 Amazon Web Services✓CDN Cloudflare✓

Amazon Web Services: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

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 83 KB (vs 12190 KB first visit). 522 of 526 resources are served from browser cache, saving 2.80g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 2.82g)

First visit

12190 KB

Repeat visit

83 KB

99% reduction on repeat visits

Saving 2.80g CO2 per returning visitor

522 resources served from cache · 4 resources re-downloaded

A+

Web Font Weight Variants

2 font weights loaded across 1 famil(y/ies) -- reasonable

PASS

2 font weights loaded across 1 famil(y/ies) -- reasonable

2 font weight(s) loaded across 1 famil(y/ies)

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Image Optimization

200 images, 1010 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

200

Total Size

1010 KB

9 missing dimensions 4 missing lazy loading

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