Sustainability

· 6 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 2 FIX

CO2 Per Page Load

Action

1.42g CO2 per view

FIX

1.42g CO2 per view

1.42g CO2 per page view

This page transfers 6.0 MB, producing an estimated 1.42g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.29g, end-user device 1.09g.

Got: 1.42g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 170.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 170.6 kg of CO2 annually — equivalent to charging 21321 smartphones.

Green hosting reduces data center emissions

1.42g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 27% of websites

Sustainable Web Design model v4 · Page size: 6.0 MB

Your site

1.42g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.04g

Network

0.29g

End-user device

1.09g

At 10,000 monthly views: Monthly: 14.2 kg · Annual: 170.6 kg · ≈ 21321 smartphone charges

Carbon Budget

Action

73th percentile

FIX

73th percentile

1.42g CO2 — above the median website (0.60g)

Heavier than an estimated 27% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 73th percentile

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

Top 10%

Target

Median website

1.42g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 137% more

vs Target 184% more

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Next.js, CDN: Cloudflare

Next.js: 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 Next.js✓CDN Cloudflare✓

Next.js: 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

96% cached

PASS

96% cached

96% reduction on repeat visits

Returning visitors download only 266 KB (vs 6149 KB first visit). 131 of 136 resources are served from browser cache, saving 1.36g CO2 per repeat visit.

Repeat visit: 0.06g CO2 (first visit: 1.42g)

First visit

6149 KB

Repeat visit

266 KB

96% reduction on repeat visits

Saving 1.36g CO2 per returning visitor

131 resources served from cache · 5 resources re-downloaded

A+

Transfer Efficiency

91% efficient

PASS

91% efficient

Transfer efficiency: 91%

Only 529 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 529 KB (9% of page weight)

Unused JS 529 KB

0.12g unnecessary CO2 per visit

Actual transfer 6149 KB

Theoretical minimum 5619 KB

Potential savings 529 KB (0.12g CO2)

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: Cloudflare

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